Saintly Sister (Merciless)

Saintly Sister (Merciless) is an Advent Stage unlocked after clearing Dead by Encore. It appears on the 3rd, 4th, 17th, and 18th of every month. Upon completion, players have a 30% chance to unlock Cossack Cat. This is a No Continues stage.
==Battleground==
*1 Heavenly Herald Papuu spawns as the boss after 3.33 seconds100f.
*Infinite Sir Rels spawn after 10 seconds300f, delay 34.67~37.33 seconds1,040f~1,120f.
*Infinite Wall Doges spawn after 10 seconds300f, delay 46.67~49.33 seconds1,400f~1,480f.
*1 Sir Rel spawns after 13.33 seconds400f.
*1 Dagshund spawns after 23.33 seconds700f.
*2 Sir Rels spawn after 70 seconds2,100f, delay 14.67~17.33 seconds440f~520f.
*1 Dagshund spawns after 116.67 seconds3,500f.
*2 Sir Rels spawn after 156.67 seconds4,700f, delay 14.67~17.33 seconds440f~520f.
*1 Dagshund spawns after 203.33 seconds6,100f.
==Strategy==
Due to Papuu's immense range and Toxic ability, you should expect to replace non-immune small units frequently. It's very difficult to prevent Papuu from ever damaging your base, but not impossible with hypermaxed units and a perfect run. Luckily, Toxic doesn't affect the Cat Base, hence having more Cat Base health (from levels, Ototo Corps and Cat Combos) buys you more time to continue fighting.
It is also recommended that you try to defeat two (or all three) Dagshunds before moving onto Papuu. If you trigger her "Strengthen" ability before killing the two or three of the Dagshunds, she can destroy your base much faster when dealing with the last Dagshund (though this probably doesn't matter if your cats are at a high enough level).
Much like Daboo, Papuu is immune to knockback effects (including the Breakerblast Cannon), and also cannot be hit by waves. Sniper the Cat is the only battle item able to keep her away from your base. If you have unlocked the Curseblast you can use it to buy some additional time, which can make all the difference in battle as long as it manages to dismiss a single toxic attack.
Recommended/Usable Cats: Using a Riceball Cat with the Immune to Toxic Talent can really help with stalling Papuu and the peons without getting harmed by the notorious Toxic effect, using Bakery Cat can help by removing Papuu's Toxic (though a precise setup is required), and Can Can Cat can greatly help with the Extra Money and Move Speed Up Talent as it can go to the frontline quickly, do some damage, and give you a lot of cash if used right.
===Recommended Ubers=== 
The following Uber Rares are good for this stage, and if you have any of these, using them will make things easier. Considering how Pappu is already weak to spammable attackers, however, most of them are just overkill. 
*Kasa Jizo: Deals massive damage to Angels. Can whittle down Papuu's health and is relatively cheap, as well as fast.
*Lassvoss Reborn: Lasvoss gains toxic immunity in True Form and is a great choice for dealing heavy direct damage as a midranger.
*Greater Balrog Cat: A talented Greater Balrog is essentially a stronger Can Can, able to melt strong peons and deal heavy damage to Papuu. 
*Hades the Punisher: His immunity to Toxic and tremendous health allows him to tank many Papuu hits. With the right support, Hades can keep her away long enough for you to win the fight.
*Kinrangers Gigaforce: In True Form, Kinrangers have a high chance to curse Angel enemies, rendering Papuu a non-threat. Just time Kinrangers whenever the path to Papuu is clear and time a Curseblast to ensure the rangers stay at high health.
*Kalisa: Not very effective when Papuu isn't cursed, but can deliver crushing blows to her nonetheless. Just make sure you have enough money and there are no peons in the way. Speed Up Talents will improve her time getting to Papuu and, therefore, her time in the battle.
*Chunchun Haunters: Similar to the usage of Kinrangers Gigaforce, he can also curse Papuu, and disable her toxic attacks. You also need to time him whenever the path to Papuu is clear.
*Kasli the Bane: Much like Kinrangers Gigaforce and Chunchun Haunters, Kasli the Bane can curse Papuu to disable her toxic ability and also deal with other threats, making it that much easier for support to tag along.
*Iz the Dancer of Grief: Her manageable cost, Toxic Immunity, Curse Immunity, and her massive damage to Traitless enemies makes her invaluable here. Even at Level 30, she makes this stage a joke once summoned.
===Strategy 1 (Uberless)===
For this specific strategy, the use of Ubers or other units/Combos in place of the recommended ones is heavily discouraged, except for Awakened Bahamut Cat and very few others. Use whatever Cannon you want (except Waterblast/Holy Blast), all have pros and cons.
Items: None are required, although a Rich Cat could help a little. A Treasure Radar is recommended after first clear.
Battle: Start by letting Papuu attack your Cat Base and get your Worker Cat to level 3, then take care of the Sir Rels with Ramen Cat and Bullet Train Cat; it's crucial that your base never gets hit by them. Once you are done, spam Ramen Cats for the rest of the fight; as for the other units, you want to ALWAYS wait for Papuu to attack, then summon them, but this doesn't mean that you should always summon them whenever you can:
*Bullet Train Cat is to snipe Sir Rel; if a Sir Rel is killed before you summon it, it can be good for Dagshund too.
*Fishman Cat is good for everything, but less important, so only summon him if you have money. Prioritize the others if there is too little.
*Seafarer Cat is here for his Survive ability. He can hold his ground against the Traitless enemies and the Sir Rels well, but should never be summoned against Papuu.
*Housewife Cat is here to snipe Sir Rels or Dagshunds with her Long Distance ability.
*Ramen Cat is the main DPS source and only meatshield. Spam with priority.
The plan is to not bother keeping Papuu away from your base and just kill her. Ramen Cat's DPS is exceedingly high for a meatshield, and since he can take up to 3 hits from Papuu, you can expect to have a small group attacking her after every wave of peons. The other units are here to make quick work of said peons, giving you more time to attack the boss. As for your base, you can expect to take about 150k damage, so you should be fine, as long as you have all Treasures for base health. Lastly, once Papuu gets stronger, do not panic and keep doing what you've been doing; if you added something like Awakened Bahamut for any reason, this is the time to spawn it.
In case of a loss, make sure you only summon cats (besides Ramen Cat) just after Papuu's attacks. If you're already doing that, the problem lies in the levels of your cats, especially Ramen.
Note: In the featured attempt, Ramen was level 50+16 with a level 5 Attack Buff Talent, the others were around level 50; with this, the final health of the Cat Base was 84,000/196,000. If your Ramen is weaker, you still have plenty of health to give you extra time.
Things to note:
*Being a tank without immunity to Toxic, Green Shell Cat will not last long, so even if you send it, don't stop spamming cats.
*Keeping track of your rush unit's recharge is also important. If you have more than enough money, time it and send it at the peons or even Papuu. The faster Papuu dies, the better.
*Leave Sniper the Cat on the whole time. Sometimes people forget to turn it back on when they do turn it off.
*Timing Macho Legs well can easily kill the peons and leave Papuu open and give you more time to deal damage.
*If your whole first line is only Cat Combos, replace your rush unit with Green Shell Cat.
===Strategy 2 (Overwhelming Force)===
The focus of this lineup is that quality is better than quantity, and that attack power is better than defense, since you cannot effectively defend your base against Papuu. Once you've gotten Worker Cat to level 3 and killed off the first Sir Rel with your Bullet Train, you should spam Ramen Cats for the rest of the battle. Each time immediately after Papuu attacks, you should spawn all of the Jelly Cats, Can Can Cats, Courier Cats and Fishmen you have that are off cooldown. All have long respawn times so money shouldn't be a factor unless your Bullet Trains or Can Cans aren't killing any peons. Can Cans can be used without any Speed Up Talent but need Money Up to be effective.
Bullet Train Cats should be held in reserve for when they can finish off a peon for the double cash, although Can Can can already help with that. If your Cutter is upgraded enough, you can use it once you are flushed with cash, but it is there mainly for the second Attack Up Combo. You do not necessarily require each unit to be at level 50, level 40 or 45 can suffice, but it is highly recommended to get your units' levels as high as possible for better battle results. With high level units, you wouldn't need to worry too much about your Cat Base.
==Walkthrough==
==Gallery==
HeraldStrikes.jpg|Event Poster (EN)
==Trivia==
*Saintly Sister's Japanese name, Saintly Elder Sister (聖おねえさん Seinto Oneesan), is a reference to either the manga Saint Young Men (聖☆おにいさん Seinto☆Oniisan), or to "Saint Ojisan" (聖☆おじさん Seinto☆Ojisan), the Denki Groove and Scha Dara Purr song that inspired said manga.
==Reference==
*https://battlecats-db.com/stage/s01219-01.html
Category:Advent Stages
Category:No Continue Stages