Strategize

Acnologia seizes his laughter, "I'll demonstrate the hole of despair of into you all." He then steps forward, "This is the power of the world's mightiest Dragon King!" He finger-beams a blast in their direction, which they scatter and dodge.
Natsu jerks his head back, "Fire Dragon: ROAR!" A humongous roar is fired.
"He has that too?" Sueong thought in surprise that Natsu also has a king's mode.
Acnologia dodges the roar before getting met in the air by Gajeel, Sting, and Rogue.
"Iron Dragon: Harpoon!" Gajeel attacks, but it does nothing to him as it bounces off, "Damn!"
"Holy Shadow Dragon: Flash Fang!" The twin slayers combine their light and shadow, striking Acnologia, but he again comes out unscathed, "What?! It did nothing again!"
"Worms." Acnologia waves a wind gust.
"GAH!" They're sent flying back.
Before the Dragon king fires a finger-beam in their direction, Sueong's Ice wave stops him from firing, trapping his hand in ice.
"Incompetence." Acnologia scoffs and goes to break free, until Wendy comes into and goes for, "Sky Dragon: Arrow!" She does a whirlwind kick, but He breaks out of the Ice on time and easily stops her, "Weak." He then tosses her aside by the leg, "AGH!" She's sent skidding back.
Laxus goes for, "Lightning Dragon Iron Fist!" He attacks, but Acnologia hold it back like nothing and kicks him aside, "GAHA!" He spits out blood.
Sueong's Ice wave comes at fast speed, which Acnologia jumps and dodges, but gets caught frozen by the leg, "Gotcha!" He then jerks his head, "Ice Dragon's: ROAR!" Hurricane of Ice shards incoming, but Acnologia breaks his feet out the Ice and counters with finger-beam, clashing through the roar, and hits Sueong, causing an explosion and sends him skidding back as well.
"Now do you see, inferior dragons? Resistance is futile." He boasts and stands with no injure on him, "This is Reality."
The Dragon slayers groan in pain before slowly getting up again.
"There's got to be something that will work!" Sting groans.
"Right, something needs to get through his incredible defense." Rogue adds.
"There has to be. We have to exploit it." Wendy agrees.
"We'll just keep attacking." Gajeel said.
"It's the best chance we've got." Laxus agrees.
"All right, then let's commence another assault." Natsu is ready to rush in, but...
"No, Hold on." Sueong stops him.
"What are you doing?" Natsu asks.
"It's about time we gonna stop with the reckless acts. That's already been used multiple times and It's not going to work on him. He's basically reading us like a book right now." Sueong explains to the group, "This time, we need a strategy. That's the only other way."
"Do we even have time for that?" Natsu asks.
"We'll force ourselves to get set up if that's the case." Sueong rebukes.
"A strategy meeting? How inconceivable." Acnologia chuckles, "You guys are free to come up with hopeless. It's never going to work against the king of Dragons!" He points in there directions and fires a beam, to which Sueong quickly forms an Ice wall in defense to shield them.
Then by the time the second finger-beam shatters the Ice wall, the dragon slayers are nowhere to be found.
"Oh? A temporary retreat? Strategize all you like. It's an inferior and worthless plan than will never hold a candle to me!" Acnologia states, amused by their tactics, "I know exactly where you inferior dragons are, but a King of dragons doesn't need to waste himself on hunting a bunch of worms." He decides to stay in one place, "I'll be standing right here, waiting for constant hopeless strategies."
Meanwhile, the other slayers are behind a brick of crystal shards, staying low for now.
"That guy is totally looking down and underestimating us!" Natsu whispers, offended, "I'm going in."
"Would you quit being an idiot already!" Sueong stops him, "It should be obvious that he's trying to provoke us."
"Like I care, I'm gonna go in there and-" Natsu's as about to say but gets interrupted.
"And what? Do the same reckless idiotic act? Good luck on that." Sueong rebukes.
"What...?!" Natsu gets mad at that.
"Come on, you two, enough." Sting breaks up.
"This is not time to bicker. We're on a time limit here." Rogue adds.
"For the record, Sueong's right. If we actually want to injure Acnologia, then we need a well executed plan." Laxus agrees.
"Same here, never thought I'd admit." Gajeel adds.
"Yes. We have to pull off something." Wendy nods, so do the twin slayers.
"Do you have a plan?" Cobra asks the Ice boy.
"Sure do. One that'll work and turn the tide of the fight." He then glances at Natsu, "Now it's up to you, are you in or not?" Sueong frowns.
Natsu glares for a second and replies, "Fine." He sighs.
"All right, then let's get on with this." Sueong starts going over it.
Fast-forward, With the plan in mind and ready. Acnologia yawns as he still stands in the same spot, "Well?" He looks around, "If that so-called strategy isn't in action, then I'll just proceed to killing you dragons instead!"
Suddenly, Sueong appears on top the crystal charges, staring down at Acnologia.
"So you finally reveal yourself? Give me a real challenge if you choose to take me on alone." Acnologia grins.
"Heh." Sueong just waves a hand, and Ice goes towards the dragon king with he sidesteps and dodges.
"What was that? Practice exercise?" Acnologia mocks.
"Heh." Sueong then commences the plan.
Natsu comes in with flames ignited, "Fire Dragon's: Iron Fist!" He connects but it does nothing.
"You never learn." Acnologia punches him aside, but Natsu doesn't give up and still engages, which he ends up getting kicked back.
"Eat this!" Sting fires multiple light beams, which Acnologia dodges them all. Rogue comes from the shadows under ground and tries to attack as well, but his shadow fist ends up getting sidestepped and he gets a knee to the stomach, spitting out blood and sent back. Gajeel and Laxus come in with their own element attacks, but receive the same treatment, "You mere mortals haven't learned a thing."
"That's my cue!" Cobra jumps in the air, "Poison Dragon ROAR!" It's humongous, which Acnologia puts his hand in front and counters it, holding it back.
"It's time!" Sueong gets his Ice Spear ready and signals Wendy.
"Right!" She complies, "Deus Eques!" She enchants his spear to make it more powerful.
"Alright." Sueong then takes a step, "Take this!" and throughs it at high speed.
Acnologia gets rid of the Poison roar and sees the spear coming fast at him, "Such speed." He thought before it hits him, creating an explosion of Ice.
Flashback of the strategy:
"All right, then let's get on with this." Sueong starts, "Acnologia's speed and power is insane. Straight-forward attacks are almost useless against him."
"Then what do you suppose we do." Cobra asks. 
"He won't be taking damage by anything less than a full power attack or close to it." Sueong replies, "I learned that when I striked him with my ice blades earlier." 
"What about an actual fist." Sting asks.
"Same goes for that of course. He was blocking and dodging those like it was nothing." Sueong adds.
"I also want to add in the fact that he has diamond-like skin. Which is another pain in the ass." Gajeel adds.
"That's exactly why I got a plan." He then sets it out, "I'll try and pierce his skin with Ice Make: Spear, so you guys will distract him a little."
"Hold on, why not a dragon roar?" Natsu asks.
"Because that would be pointless, seeing as we already tried that and those did nothing to him." Sueong replies, "Adding to the fact I'm the only one with Ice-make as well. So this spear will pierce right through his skin if it lands at the right time." 
"Aww man." Natsu pouts, "And I wanted to land that strike in on him."
"Fine, since you want to go in that badly, then you, Flame brain, will be the first distractor, followed by white light, shadows, Iron head, and Big guy." He nicknames, "Mind stalker will come in last." 
"Look at him, giving us all some nicknames." Cobra whispers and scoffs, with Natsu and Gajeel all dramatically mad-looking at their nicknames. 
"Pretty cool though." Sting thought, liking his.
"Mines could have been better." Laxus thought.
"Uh... what about me?" Wendy points to herself.
He glance at her, "Shorty, I'll need you to enhance my spear with your enchantments. That'll be useful too." 
"Oh, okay." Wendy nods, also not minding the nickname. 
"Just to be sure, what if this plan fails?" Laxus asks.
"Already planned ahead." Sueong then points at his left bandaged shoulder, revealing, "I'll just use my trump card right away if that fails." 
"Trump card?" Natsu narrows a brow, so do the rest. 
"You'll see later." Sueong then adds this to them, "I'll get him move with just one wave of ice before you guys do your parts."
"It's worth a shot." Rogue goes with it. 
"All right, let's do it." Sting nods, so do the rest, except Natsu.
"Great." Sueong stands up, "Follow my lead-"
"Hold on." Natsu interrupts, which they glance at him, "If I'm the first to distract him, then why don't I take the lead?"
"Like I said before, if you're planning on doing a roar or fist attacks straightforwardly, it's not ain't gonna cut it. I'm not repeating this again." Sueong replies, "Besides, It's no doubt he'll dodge my incoming wave of ice so let's just get to it." He then goes out to the open."
"You'll just have to trust his plan, salamander." Gajeel said.
"It'll succeed for sure." Wendy nods.
"It's now or never." Cobra nods. 
Natsu still isn't thrilled, but understands, "I get it. Let's go follow suit." He and the rest join sueong and commence it.
Present. While the dragon slayers stand and stare at the smoke, "Did the plan succeed?" Natsu wonders.
"Did that get him?" Rogue wonders too.
"The smokes clearing up." Laxus alerts.
It clears and Acnologia appears unscathed, having caught the ice spear before it damaged him, the tip of it only touching his skin, "Heh heh heh!" He grins, which shocks them.
"He caught it?!" Gajeel exclaims.
"It only touched his skin..." Sting notices.
"Our strategy failed?! No way!" Wendy exclaims.
"Damn..." Sueong curses.
"We almost had him too, but there's still more where that came from!" Natsu shouts, not backing down, which the rest of the slayers agree.
"Then it's about time I use 'that'." Sueong gets ready to reveal a certain trump card, touching his left bandaged shoulder.
Acnologia takes a step up while everyone is prepared to fight, "I must say, for inferior dragons, that wasn't bad. A little bit more and that Ice spear would have pierced me while off-guard." He shatters it with his bare hands before glancing at sueong, "I suppose it was you that planned this out?"
"What of it?" Sueong rebukes, narrowing a brow.
"Out of the 8 of you, You look to be the most level-headed and tactician one. If I were to let you do anymore planning, then slowly, but surely, you might be able to finally inflict fatal strikes upon me." Acnologia then reveals this and grins, "So... I'll just take you down first." He points at the Ice slayer.
Hearing this makes the dragon slayers even more ready, "Taking out the tactician of the team may be a good move, but that's not happening here." Rogue said.
"Especially not on our watch." Sting adds.
"Got that right. We're all still here!" Natsu declares.
"Oh-ho? The same goes for all of you, but 3 seconds later." Acnologia states it out before forming purple balls around him, "In return, All of you will be blown away!" He fires light purple blasts everywhere in the time rift.
"Take cover!" Natsu shouts as he and the rest of the slayers scatter and dodge the beams from every direction, with Sueong only forming a wall to shield him and Wendy.
"Are you gonna use the use your trump card now?" Wendy asks as she takes cover behind the ice wall.
"Already on that, just wait." Sueong replies before sensing, "!" He feels that a huge beam is coming and acts, "Time to fly!" He quickly grabs wendy with one arm and takes off, dodging the next big beam that destroys his wall.
"That was too close." Sueong sighs before setting wendy down. The rest of the slayers gather up as well.
"You're about to that trump card of yours, right Sueong? If it takes time then we can hold him off." Natsu offers.
"It really doesn't but by all means, do as you wish." Sueong replies as they glare at Acnologia.
"Let's step this up a notch, shall we?" He grins menacingly as he prepares to attack.