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Terestian Illhoof is a demon boss in Karazhan. The Terestian Illhoof boss is a fight that requires coordination above all else.
 
Before the real combat starts, have everyone in the raid make a macro that uses /target demon chains. This will come in handy during the fight and can make or break it. 
   
In the beginning, the main tank will aggro Terestian Illhoof and the off tank will aggro Kil'rek, his imp. Have your warlock use Seed of Corruption the imp adds that will spawn. The imp adds have a Firebolt that does 150 damage and 650 damage if target has Amplify Magic.
 
Have all of the DPS kill Kil'rek first, and then you should focus on Terestian Illhoof. The imp has a spell that amplifies flames. This is not dispelable and is placed on the highest threat person in the raid, increasing fire damage. Broken Pact is his other of his spells. When the imp dies it increases damage done to Terestian Illhoof by a quarter
 
Terestian Illhoof will use a spell called heal. It will summon a character to the center of the room and bind them in chains called Demon Chains. They are hard to target so the macro will help if used during this time. The chains must be destroyed immediately because they drain the life from the player while healing Terestian Illhoof for a high amount.
 
Once the chain is broken, DPS players can go back to killing Terestian Illhoof. The imp, Kil'rek, will respawn and must be killed again. He must be killed with in 10 minutes or he will go Berserk and spam Shadow Bolts on the raid and wipe it.
 
If the imp is killed right away, then the raid should have no problem killing Terestian Illhoof.