Tethra

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The Boss for the Kaybern Domain is Tethra.
It is of the Adventurer class and deals significant AoE damage. Reminiscent of the Cheerful Yowis (Green Cube Boss), it can deal AoE damage and jump back after a while. It also has Bleed DoT, against which Kino is great.
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Name 	Description 	Notes
Sand Stuff 	Swings a sand stuff at 3 nearby enemies, knocking them back with damage. 	Knockback causes Adventurers to be at a disadvantage.
Sand Armor 	Its sand armor resists Knockback and Stun by 100% and Projectile damage by 40%, and triggers an obliterating attack after 40 seconds. 	Makes archers much less useful, making Mages or Adventurers your prime choice.
Charge! 	Tethra's first attack in a battle causes severe knockback, and it moves far backward. 	
Sand Twister	Summons a sand twister to attack 3 enemies in the rear once every 7 seconds. Stuns them for 3 seconds, and inflicts Bleeding damage every 1.3seconds for 5.2seconds.	Kino helps cut down on the Bleeding damage.
Sandstorm 	After every 6 attacks, summons a sandstorm, blowing all enemies far away. Also inflicts bleeding damage every 1.3 seconds for 5.2 seconds. 	This attack will cause significant damage. Using adventurers means increasing the frequency of this attack.
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As long as you can keep your units alive, Sylar can pull most of the weight damage-wise. The Domain Lord is useless so think of this as a 4 companions fight. Ashes helps mitigate the damage by a lot.
	
	
	
	
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Another Team uses Rudra to slow and immobilize Tethra, immensely reducing the frequency of damage dealt by it.