Undyne/In Battle

Undyne is the third boss of the Neutral and True Pacifist route. Atop Waterfall's crag, she gives a speech to the protagonist near the "Undyne Arena" SAVE Point.
Undyne attacks with varying spear patterns from different sides of the Bullet Board. With a flick of her spear, Undyne can change the protagonist's SOUL mode to Red or Green. Persistent in her goal, Undyne attacks when her HP is 0, and continues encounters if the protagonist flees.
On the Genocide Route, Undyne's battle begins before the "Undyne Arena," atop the bridge. Undyne defends Monster Kid from the protagonist's attack, at the expense of her life. However, realizing the severity and through Determination, she becomes Undyne the Undying.
== Attacks ==
=== SOUL Modes ===
Green Mode is used initially, with the red mode being used twice briefly, and then exclusively following the last set of attacks in green mode.
=== Patterns ===
: Note: All damages assume no armor, Neutral or True Pacifist Route, and LV 1. In the Genocide Route, these attacks deal 8-14 damage.
; Green SOUL
* She throws arrows from all sides at the protagonist in Green mode, including specifically slow and fast moving arrows, as well as arrows that flip the orientation that they are approaching from. These attacks do 5 damage per hit.
; Red SOUL
* She restricts the Bullet Board to a minuscule box which launches spears upwards toward the protagonist in three columns. This attack has a pixel-perfect safe spot between the left and center spears. This attack does 5 damage per hit.
* She also throws a volley of continuous spears at the protagonist on a larger Board. This attack does 5 damage per hit.
* After changing the SOUL mode to red at the end of an attack in green mode, she throws a single spear at the protagonist. This attack does 4 damage per hit and is not used by Undyne the Undying.
* In the Genocide Route, Undyne the Undying repeats the following four attacks endlessly after finishing all of her Green SOUL attacks:
** Continuously summons rings of six spears that converge on the SOUL. The interval between rings becomes shorter as the attack goes on.
** Summons rotating rings of spears that converge on the SOUL.
** Rapidly summons individual spears that target the SOUL.
** Restricts the Bullet Board to a small box that launches spears upward in three columns.
== Strategy ==
To spare Undyne, the protagonist must deflect her spears while in Green Mode and flee from her while in Red Mode (they cannot escape in Green Mode), gradually making their way through the cave she was guarding. After completing a number of green phases (first 6, then 4 and then 8), she switches the protagonist to Red Mode while throwing a spear that can be dodged by moving down. Once in Red Mode, the protagonist can escape. When the protagonist flees, she chases them down. Due to her fast speed, she catches up with them and switches them back to Green Mode until they have endured at least three rounds, with each one being harder than the last. Undyne the Undying, however, must be fought since the protagonist cannot spare her or escape from her even when they are in Red Mode.
If the protagonist does not escape while in Red Mode, Undyne throws more spears and then switches them back to Green Mode for the next round. Fleeing from her as soon as possible makes the battle significantly easier than trying to weather the three required rounds of Green Mode in one go, as she progressively increases her projectile speed over the course of the fight while fleeing resets the speed. If the protagonist does not flee, Undyne continues attacking, and the speed of her attacks continues to increase. The protagonist can also escape back the way they came from, although Undyne catches up quickly, as she enters the screen right behind the protagonist. Continuing to flee into Waterfall causes Undyne to halt her pursuit, but she re-initiates her fight when the protagonist returns.
If the protagonist reaches Hotland, Undyne stops for a moment to look at Sans sleeping at a checkpoint, giving more time for the protagonist to outrun her. Sans does not appear sleeping at the checkpoint if Papyrus was killed; however, the protagonist can still outrun Undyne in Hotland as long as they continue to flee from her. The protagonist must then run across a bridge until they reach an area with a water container. Then, Undyne slowly tries to reach them, but she collapses and faints due to the high heat, leaving her unable to attack. At this point, the protagonist can either keep walking or pour water on her, the latter letting her leave and making the Undyne hangout available on the True Pacifist Route, or a Neutral Route where no monsters have been killed and Papyrus has been befriended.
If Undyne's HP reaches certain values while in Green Mode, she cuts the current Green Mode cycle short and turns the SOUL red ahead of when she would normally do it. This is most likely to ensure that she always turns the SOUL red three times in the Neutral Route.
As mentioned above, Undyne's projectile speed increases throughout the battle, resetting if the protagonist escapes during Red Mode. This can also be changed by Undyne's ACTs; the Challenge ACT immediately increases her projectile speed, while the Plead ACT reduces it (each within certain thresholds). Additionally, if the protagonist deliberately gets hit by Undyne's first attack four times in a row, her projectiles become very fast and she uses one of her hardest attacks before switching to Red Mode, skipping her first two Green Mode phases.
=== Undyne the Undying ===
One potential strategy for fighting Undyne the Undying is to equip both the Torn Notebook and Cloudy Glasses for increased invincibility frames. This can enable longer survivability if the player is not confident in their dodging.
Due to the different EXP gains available from each type of enemy, the protagonist's LV when fighting Undyne is variable (unlike the endgame boss Sans or True Pacifist battles, but like all Neutral Route fights). Specifically, it can range anywhere between LV 8 and LV 13, with the most notable choice being to grind as many as 15 Glyde battles for its 100 EXP reward. Higher LV increases the protagonist's HP, but against Undyne the Undying, it also has the negative effect of reducing base INV by 1 frame for each level, which thus ranges between 17 and 21 frames (0.56 and 0.7 seconds) rather than the normal 30 frames (1 second). This can make the notebook and glasses even more useful for certain bullet patterns.
== Mechanics ==
If Undyne's health reaches 0, she manages to cling on to life with Determination and survives further attacks from the protagonist. The protagonist's SOUL returns to Green Mode, preventing the protagonist from fleeing. Undyne's arrows move slower each turn, and every time she attacks, more of her body begins to ripple and split apart. Eventually, she reforms due to her Determination, causing her to have more Determination than her monster body can handle. Because of this, she melts (similar to the Amalgamates in the True Lab near the end of the True Pacifist Route) and begins to disintegrate. The protagonist is unable to end the battle by sparing her while this is happening, and whether or not they attack her has no effect on how quickly she dies.
== Quotes ==
=== Speeches ===
* Seven.
* Seven human souls, and King ASGORE will become a god.
* Six.
* That's how many we have collected thus far.
* Understand?
* Through your seventh and final soul, this world will be transformed.
* First, however, as is customary for those who make it this far...
* I shall tell you the tragic tale of our people.
* It all started, long ago...
* [If the protagonist hasn't killed any monsters]
** ...
** No, you know what?
** SCREW IT!
** WHY SHOULD I TELL THAT STORY
** WHEN YOU'RE ABOUT TO DIE!?!
** NGAAAAAHHHHHHHHHHHHHHHHH!
** YOU!
** You're standing in the way of everybody's hopes and dreams!
** Alphys's history books made me think humans were cool...
** ... with their giant robots and flowery swordswomen.
** BUT YOU?
** You're just a coward!
** Hiding behind that kid so you could run away from me again! [If the protagonist saved Monster Kid]
** You abandoned your friend just so you could run away! [If the protagonist did not save Monster Kid]
** [Normal]
*** And let's not forget your wimpy goody-two-shoes-schtick!
*** Oooh! I'm making such a difference by hugging random strangers!
*** You know what would be more valuable to everyone?
*** IF YOU WERE DEAD!!!
*** That's right, human! Your continued existence is a crime!
*** Your life is all that stands between us and our freedom!
*** Right now, I can feel everyone's hearts pounding together!
*** Everyone's been waiting their whole lives for this moment!
*** But we're not nervous at all.
*** When everyone puts their hearts together, they can't lose!
*** Now, human! Let's end this, right here, right now.
*** I'll show you how determined monsters can be!
*** Step forward when you're ready! Fuhuhuhu!
** [If the protagonist befriended Undyne on a previous playthrough]
*** And! And!
*** ... and something's been bothering me, too.
*** The whole time I was chasing after you...
*** I felt something... Strange.
*** The echoes of something warm, something...
*** Something like "I miss being friends with you."
*** BUT THAT'S RIDICULOUS!
*** I WOULD NEVER GET CHUMMY WITH A COWARD LIKE YOU!
*** You! You must have been mind-controlling me!
*** Manipulating people to make them like you... What a Grade-A FREAK!
*** Now enough! For everyone's hopes! For everyone's dreams!
*** And for my own freaking dignity!
*** I, UNDYNE, will knock you down!
* [If the protagonist has killed monsters, but not Papyrus]
** ...
** No, you know what?
** SCREW IT!
** WHY SHOULD I TELL THAT STORY
** WHEN YOU'RE ABOUT TO DIE!?!
** NGAAAAAHHHHHHHHHHHHHHHHH!
** YOU!
** You're standing in the way of everybody's hopes and dreams!
** Alphys's history books made me think humans were compassionate...
** BUT YOU?
** You're just a remorseless criminal!
** You wander through the caverns, attacking anyone in your path.
** Self-defense? Please.
** You didn't kill them because you had to.
** You killed them because it was easy for you.
** Because it was fun for you.
** Do you think it was fun when I found out...?
** [If the protagonist has killed no significant enemies]
*** Do you think it's fun when people's family members...
*** ... never come home? Is that fun?
** [If only Snowdrake was killed]
*** A teenage comedian who fell in with the wrong crowd...
*** ... was dead, because of the whims of a single human?
** [If only Doggo was killed]
*** Doggo, who always made me laugh...
*** ... was dead, because of the whims of a single human?
** [If only Lesser Dog was killed]
*** Lesser Dog, who wanted nothing more than affection...
*** ... was dead, because of the whims of a single human?
** [If only Dogamy and Dogaressa were killed]
*** Those two sweet dogs, who always took care of each other...
*** ... were dead, because of the whims of a single human?
** [If only Greater Dog was killed]
*** That big dog, who wanted nothing more than to play...
*** ... was dead, because of the whims of a single human?
** [If all canine Royal Guards were killed]
*** The Snowdin Canine Unit had been completely decimated.
*** My troops and friends, destroyed... Is that fun?
** [If only Shyren was killed]
*** Shyren, who was just learning to sing...
*** ... was dead, because of the whims of a single human?
** No.
** But your time's up, villain!
** You won't hurt anyone else.
** A knight in shining armor has appeared.
** And all the pain you inflicted on the fallen...
** Every hope, every dream you've turned to dust...
** She's gonna send right back through her spear!
** NGAHHH!!!
** I'll show you how determined monsters truly are!
** Come on! Step forward and let's end this!
* [If Papyrus is dead]
** ...
** Forget it.
** Look.
** Papyrus didn't come to his meeting today.
** Say what you want about him.
** He's weird, he's naive, he's self-absorbed...
** But Papyrus has NEVER missed a meeting.
** And no matter what time you call him on the phone...
** Night, day, afternoon, morning...
** He ALWAYS answers within the first two rings.
** ...
** But now he's gone.
** And his brother isn't around, either.
** ...
** What did you do to him?
** What did you DO TO HIM?
** Papyrus, who I have trained every day...
** Even though I KNOW he's too goofy to ever hurt anyone...
** ...
** Go ahead. Prepare however you want.
** But when you step forward...
** I will KILL you.
* TEST!!! [Unused]
=== Pre-Battle ===
; Normal
* That's it, then...!
* No more running away!
* HERE I COME!!!!!!!
* [Fleeing, leaving the Undyne Arena, and returning]
** I KNEW you would come back here!
** HERE I COME!!!!!!!
; Faux
* Ah.
* Man, no wonder Papyrus sucks at cooking.
* So what's next? Scrapbooking? Friendship bracelets?
* ...
* ... oh, who am I kidding.
* I really screwed this up, didn't I?
* I can't force you to like me, human.
* Some people just don't get along with each other.
* I understand if you feel that way about me.
* And if we can't be friends...
* That's okay.
* Because... If we're not friends...
* IT MEANS I CAN DESTROY YOU WITHOUT REGRET!
=== Battle ===
; Undying
* [Attack at Monster Kid]
** [Monster Kid] Undyne... You're... You're hurt...
** Hurt? It's nothing.
** Next time, listen when I tell you to leave, okay?
** [Monster Kid] Undyne... I...
** I'll take care of this!
** Get out of here!
** [Occurs the first time]
*** ... heh... "It's nothing"...
*** No... s-somehow, with just one hit...
*** I'm already...
*** Already...
*** D... damn it....
*** Papyrus... Alphys... ASGORE...
*** Just like that, I...
*** I've failed you.
*** ...
*** No...
*** My body... It feels like it's splitting apart.
*** Like any instant... I'll scatter into a million pieces.
*** But...
*** Deep, deep in my soul.
*** There's a burning feeling I can't describe.
*** A burning feeling that WON'T let me die.
*** This isn't just about monsters anymore, is it?
*** If you get past me, you'll...
*** You'll destroy them all, won't you?
*** Monsters... Humans... Everyone...
*** Everyone's hopes. Everyone's dreams. Vanquished in an instant.
*** But I WON'T let you do that.
*** Right now, everyone in the world...
*** I can feel their hearts beating as one.
*** And we all have ONE goal.
*** To defeat YOU.
*** Human. No, WHATEVER you are.
*** For the sake of the whole world...
*** I, UNDYNE, will strike you down!
*** You're gonna have to try a little harder than THAT.
** [Subsequent rematches after dying (without quitting)]
*** You...
*** You're gonna have to try a little harder than THAT!
* [Defeat]
** Damn it...
** So even THAT power... It wasn't enough...?
** ...
** Heh...
** Heheheh...
** If you...
** If you think I'm gonna give up hope, you're wrong.
** Cause I've... Got my friends behind me.
** Alphys told me that she would watch me fight you...
** And if anything went wrong, she would... evacuate everyone.
** By now she's called ASGORE and told him to absorb the 6 human SOULs.
** And with that power...
** This world will live on...!
; Normal
* En guarde! [Encounter]
* You won't get away from me this time! [Encounter #2]
* You've escaped from me for the LAST time! [Encounter #3]
* STOP RUNNING AWAY!!! [Encounter #4]
* COME BACK HERE, YOU LITTLE PUNK!! [Encounter #5+]
* Ngahhh! [Neutral; unused]
* Bring it on! [Neutral; unused]
* C'mon! [Neutral; unused]
* Fuhuhu! [Neutral; unused]
* Ngahh!! [Neutral; unused]
* Urahhh!! [Neutral; unused]
* You're strong... But not strong enough! [Neutral; unused]
* You're a pain in the neck, huh? [Neutral; unused]
* DIE ALREADY, YOU LITTLE BRAT! [Neutral; unused]
* [Turn]
** As long as you're GREEN you CAN'T ESCAPE!
** Unless you learn to face danger head-on...
** You won't last a SECOND against ME!
* Not bad! Then how about THIS!? [Turn 2]
** [if take a hit]
*** When I said face towards danger...
*** I meant face towards the bullets!
** [if take a hit #2]
*** Look.
*** I gave you a spear to block the bullets with.
*** Do I have to explain this any more clearly?
** [if take a hit #3]
*** WHAT ARE YOU DOING?
*** JUST FACE UPWARDS!!!
*** IT'S NOT HARD!
** [if take a hit #4]
*** I wanted this to be a fair fight.
*** I thought if I beat you like this...
*** It'd truly show how strong monsters can be.
*** BUT NOW???
*** I DON'T CARE!
*** I'M NOT YOUR FREAKING KINDERGARTEN TEACHER!
*** Unless your kindergarten teacher...
*** DOES THIS!
** [Spare; unused]
*** You? Sparing ME? Fuhuhuhu!
*** How insulting! I'd NEVER surrender to the likes of you!
* For years, we've dreamed of a happy ending... [Turn 3]
* And now, sunlight is just within our reach! [Turn 4]
* I won't let you snatch it away from us! [Turn 5]
* NGAHHH! Enough warming up! [Turn 6]
* Heh... You're tough! [Turn 7]
** [Spare after Undyne re-enables red mode]
*** Mercy! Ha!
*** I still can't believe YOU want to spare ME!
* But even if you could beat me... [Turn 8, neither Sparing nor Fleeing]
* But even if I spared YOU... [Turn 8, Spare after Undyne re-enables red mode]
* Honestly, I'm doing you a favor... [Turn 8, Undyne catching up to the protagonist first time]
* No human has EVER made it past ASGORE! [Turn 9]
* Honestly, killing you now is an act of mercy...! [Turn 10]
** Killing you now is an act of mercy! [Undyne catching up to the protagonist first time]
* ... [Turn 11]
* So STOP being so damn resilient! [Turn 12]
* What the hell are humans made out of!? [Turn 13]
* Anyone else would be DEAD by now! [Turn 14]
* Alphys told me humans were determined... [Turn 15]
* I see now what she meant by that! [Turn 16]
* But I'm determined, too! [Turn 17]
* Determined to end this RIGHT NOW! [Turn 18]
* ... RIGHT NOW! [Turn 19]
* ... RIGHT... ... ... NOW!! [Turn 20]
* Ha... Ha... [Turn 21]
* NGAHHH!!! DIE ALREADY, YOU LITTLE BRAT! [Turn 22]
* YOU'RE GETTING IN MY WAY! [Turn 23]
** I WILL NEVER TAKE MERCY FROM THE LIKES OF YOU! [Spare after Undyne re-enables red mode]
* I WILL NOT BE DEFEATED! [Turn 24]
** YOU! WILL! NEVER! SPARE! ME! [Spare after Undyne re-enables red mode]
* YOU'LL NEVER ESCAPE FROM ME!!! [Turn 25+]
; Normal (Undyne's health reaches 0)
* [Defeated]
** Ngahhh...
** You were stronger... Than I thought...
** So then... ... this is where... ... it ends...
** ...
** No...
** NO!
** I won't die!
** Alphys... Asgore... Papyrus...
** Everyone is counting on me to protect them!
** NNNNGAH!
** Human!
** In the name of everybody's hopes and dreams...
** I WILL DEFEAT YOU!
* Come on, is that all you've got!? [Turn]
* [Turn 2]
** ... pathetic.
** You're going to have to try harder than that!
* S-see how strong we are when we believe in ourselves? [Turn 3]
* [Turn 4]
** H... heh...
** Had enough yet?
* [Turn 5]
** ...
** ... I won't... ... give up...
* [Turn 6]
** ...
** Ha... ha...
** ... Alphys...
** This is what I was afraid of...
** This is why I never told you...
** ...
** No... No!
** Not yet!
** I won't die!
** NGAHHHHHHHH!!!
** I WON'T DIE! 
** I WON'T DIE!
** I WON'T DIE!
** I WON'T
; Faux
* [Encounter]
** I've been defeated... My house is in shambles...
** I even failed to befriend you.
** That's it.
** I don't care if you're my guest anymore.
** One final rematch! All out on both sides!!!
** IT'S THE ONLY WAY I CAN REGAIN MY LOST PRIDE!!!
** NOW COME ON! HIT ME WITH ALL YOU'VE GOT! NGAHHHH!!!
* Show me what you've got! [Turn]
* Do your worst! [Turn 2]
* What's the matter, scared? [Turn 3]
* What the hell is the holdup? [Turn 4]
* COME ON ALREADY! [Turn 5]
* IT'S GETTING HOT IN HERE! [Turn 6]
* ... [Turn 7+]
* [Attack/Fake Attack]
** What.
** That's the best you can manage?
** Even attacking at full force...
** You just can't muster any intent to hurt me, huh?
** ...
** Heh, you know what?
** I don't actually want to hurt you either.
** At first, I hated your stupid saccharine schtick, but...
** The way you hit me right now, it...
** Reminded me of someone I used to train with.
** Now I know you aren't just some wimpy loser.
** You're a wimpy loser with a big heart!
** Just like him...
** ...
** Listen, human.
** It seems that you and ASGORE are fated to fight.
** But knowing him...
** He probably doesn't want to.
** Talk to him.
** I'm sure you can persuade him to let you go home.
** Eventually, some mean human will fall down here...
** And I'll take THEIR soul instead.
** That makes sense, right? Fuhuhu.
** Oh, and if you DO hurt ASGORE...
** I'll take the human souls... Cross the barrier...
** And beat the hell out of you!
** That's what friends are for, right?
** Fuhuhu!
** Now let's get the hell out of this flaming house!
=== Post-Battle ===
; Faux
* Well, that was fun, huh?
* We'll have to hang out again another time...!
* But, uh, somewhere else I guess.
* In the meantime, I guess I'll go hang with Papyrus.
* So if you need me, drop by Snowdin, OK!?
* OH! And if you ever need help...
* Just give Papyrus a ring, ok?
* Since we're in the same spot, I'll be able to talk too!
* Well, see ya later, punk!!
* [Passed Mettaton EX and Photoshop Flowey]
** Well, that was fun, huh?
** We'll have to hang out again another time...!
** But, uh, somewhere else I guess.
** In the meantime, I guess I'll go hang with Papyrus.
** So if you need me, drop by Snowdin, OK!?
** OH! And if you ever need help...
** Just give Papyrus a ring, ok?
** Since we're in the same spot, I'll be able to talk too!
** Well, see ya later, punk...
** OH!!! WAIT!!
** This is sudden, but...
** [Normal]
*** Can you deliver something for me?
*** Papyrus suggested that I ask you.
*** But he told me when I still hated you, so...
*** Uh! Anyway!!! Here! Just take it!
*** (You got the Undyne's Letter.)
*** Well, what are you waiting for!?
*** Go deliver it!!!
*** ...
*** Uhhhh... Oh, yeah...
*** It's addressed to Dr. Alphys.
*** OK, see you!!
** [Full inventory]
*** Can you...
*** Hey, wait! Your inventory's full.
*** Uh, well, I'll be at Papyrus's.
*** Come see me when you have less stuff!
== Flavor Text ==
; Undying
* Heroine reformed by her own DETERMINATION to save Earth. [Check]
* The heroine appears. [Encounter]
* The wind is howling... [Neutral]
; Normal
* The heroine that NEVER gives up. [Check]
* Undyne attacks! [Encounter]
* Undyne flips her spear impatiently. [Neutral]
* Undyne points heroically towards the sky. [Neutral]
* Undyne suplexes a huge boulder, just because she can. [Neutral]
* Undyne bounces impatiently. [Neutral]
* Undyne flashes a menacing smile. [Neutral]
* Undyne draws her finger across her neck. [Neutral]
* Undyne holds her fist in front of her and shakes her head. [Neutral]
* Undyne towers threateningly. [Neutral]
* Undyne thinks of her friends and pounds the ground with her fists. [Neutral]
* Smells like sushi. [Neutral]
* Undyne's eye is twitching involuntarily. [Neutral, late in the fight]
* Undyne is smashing spears on the ground. [Neutral, late in the fight]
* Undyne's eyes dart around to see if this is a prank. [Neutral, late in the fight]
* Undyne is hyperventilating. [Neutral, late in the fight]
* Smells like angry fish. [Neutral, late in the fight]
* You told Undyne you didn't want to fight. But nothing happened. [Plead, failed]
* [Plead, successful]
** You told Undyne you just want to be friends. She remembers someone...
** Her attacks became a little less extreme.
* Didn't work. [Plead; unused]
* You tell UNDYNE her attacks are too easy. The bullets get faster. [Challenge, lowest speed]
* You tell UNDYNE her attacks are too easy. The bullets get unfair. [Challenge, higher speed]
* You tell UNDYNE her attacks are too easy. She doesn't care. [Challenge, highest speed]
* Didn't work. [Challenge; unused]
* Hamburger Helpers. [Challenge; unused]
* The wind is howling... [Low HP]
* Flower pollen drifts in front of you. [Low HP]
* Water rushes around you. [Low HP]
* The spears pause for a moment. [Low HP]
; Normal (Undyne's health reaches 0)
* The heroine that NEVER gives up. [Check]
* Undyne looks determined. [Encounter]
* Undyne is smiling as if nothing is wrong. [Turn]
* Undyne's body is wavering. [Turn 2]
* Undyne's body is losing its shape. [Turn 3]
* Undyne's body... [Turn 4]
* ... [Turn 5]
; Faux
* This time, don't hold anything back! [Check]
* Undyne is letting you make the first attack. [Encounter/Neutral]
* You pretend to swing at UNDYNE with all your might. [Fake Attack]
== Trivia ==
* During the battle with Undyne the Undying, Serious Mode is activated.
* Undyne the Undying takes the most hits to defeat out of any enemy in the game.
* Undyne and Toriel are the only bosses that the protagonist can flee from during a battle.
** However, Undyne's battle can only be fled from if the protagonist's SOUL is red, and cannot be fled from on the Genocide Route.
* Undyne the Undying is the only boss in the Genocide Route that cannot be defeated in 1 hit.
* Undyne can only be seen without her eye patch as Undyne the Undying.
* Both Undyne the Undying's armor and Mettaton NEO's body closely resemble Asriel's Angel of Death form, displaying a heart on the chest (and both gloves in Undyne's case), large, spiked shoulder pads, and, in Mettaton NEO's case, enormous, vibrant wings.
* If Undyne jumps off the cliff to save Monster Kid, her HP is lowered in the following battle.
** According to Toby, he wanted her armor to be cracked too, but he forgot to add it.
* When Undyne says "En Guarde!" before her fight with the protagonist begins, the sentence is misspelled. The right spelling is "en garde," as the sentence is in French. This could also be a combination of the French and English spelling, Garde, and Guard, giving Guarde.
* If Papyrus is killed, Undyne's face appears in the dialogue box before her battle despite never taking off her helmet. If the protagonist approaches to fight Undyne, she appears without her helmet.
* Undyne's dialogue ("You're going to have to try harder than that!") in the Neutral Route after draining all her HP is similar to her final sentence when transforming into Undyne the Undying, just before she fights the protagonist ("You're gonna have to try a little harder than THAT.").
** "You're gonna have to try a little harder than THAT" is the one line of dialogue that is always uttered when Undyne is about to die, implying the Determination within is what makes her taunt the protagonist as she refuses to die or give up.
** When Undyne is reformed by her determination during the Neutral Route, any action taken during the fight makes her dialogue progress, and her body continues to deform until it dissolves into dust.
* Undyne and Mettaton are the only characters to use attacks whose colors correspond to how they move instead of how they do damage. (They all do damage as if they were white.) All of her Green Mode spears are either white and blue or yellow. Also, her spear she throws when doing a green to red switch is white and blue and has a shadow.
* When her health drops to 0, Undyne's eye color changes. What most likely shows her current condition or her determination that does not allow her to die, on the Genocide route the same thing, however her determination completely restored her.
== References ==
de:Undyne/Im Kampf
fr:Undyne/En Combat
pl:Undyne/W walce
ru:Андайн/В бою
vi:Undyne/Trong trận
zh:Undyne/戰鬥中