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The Boss's dangerous factor is his AOE roar that he will cast when there's no enemy nearby. Also, he will occasionally jump back to the right of the screen and knockback all enemies. To minimize the amount of Roar he casts you then need high MSPD units to quickly reach him.
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Name 	Description
Sonorous Shout	Lets out a sonorous shout, inflicting damage on enemies and stunning them for 2 seconds.
This skill is used after Hard Head, but canceled if enemies get close within a set amount of time
Powerful Teeth	Yowis's jaws are really powerful. Bites all nearby enemies, knock them back a distance of 250, and causes bleeding
Hard Head 	Head-butts enemies, knocking them back a distance of 900, and moves far backward
Come Here 	After biting enemies 3 times, Yowis pulls 2 enemies with highest HP to the front of it.
Agile Body 	Yowis ignores Knockback and Stun. Also goes berserk 60 seconds into the battle.
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The most annoying boss if you don't stack MSPD on your melee unit. Stacking around 200 will reduce the AoE roars to about 1-2 per fight; 220+ and he won't be able to use even one; in both those cases the fight becomes much easier as healing needs decrease, and ranged DPS butcher him.
There isn't anything that can be done about his pulls, which makes some fights a bit random (main damage gets pulled, killed, and there is nothing to do about it). Thankfully, the retries have no limit.
Lv11-12 gets a huge increase in damage on both normal attacks and roar, making shield knights (preferably with -% cube damage refines) the main choice for tanks.
Be careful with his headbutt. It can wipe your backliners if they have too low Max HP!
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Setup: 1 Tank required, 2 Ranged Damage Dealers (3 is Risky), Rest Healers/Buffers
*Tanks
**Shamu: Best choice for survivability with Bleed resist. 
**Kentom : Doesn't even need to stack MSPD with his Knockback distance/duration skill to reach Boss every time. With Fantasy and max upgrade, maybe viable even on 11-12 with good gears. 
**Jin Bachmaul: Good alternative if you don't have Ashes in your team.Downside is you have to bring Bleed Damage reduction. 
**Loujin : Not usable at lvl 11-12. Fantasy may be able to stand a chance on 11 with max upgrade. 
**Usage of Shielded Adventurers like Elpaiton is ok for lower level cube if they're accompanied with high level boss killer. 
*Ranged DPS
**Sylar : Sylar absolutely hates bosses. 
**Hecate: 2nd best boss killer for Mage 
**Ash: Best boss killer for Archer. 
**Other: Any strong single target ranged damage dealer is fine. 
*Healer/Buffer
**Elle : The strongest healer whe.
**Ashes : Reduces damage from Yowis's AoE's by 25% and reduces his PATK by 10%.
**(Jin) Anaris : Buffs knockback resistance for the whole party.
**Wedding Lin: The best buffer ingame.
**Alpha: Barrier is unique. If you take less initial damage, the Bleed Damage over time will be less as well.
**Celenia: HP buff. Increase the chance that your damage dealers who are pulled can withstand a oneshot.
**Kino: Highest ASPD and PATK buff. But the most important thing is the Bleed Damage Reduction
**Vampir: Highest Bleed damage reduction and Crit Rate buff in game. Takes up a slot for DPS.
**Debuffs like Moomyung, Wayne Height, Lin are also good choices.
Last update: 1st May 2020