Voilà, tiré directement de WoWInsider :
End Time
Echo of Sylvanas : Stay out of purple stuff on the ground. When phase 2 comes, kill the ghoul everyone's DPSing and then run over its corpse and away from Sylvanas.
Echo of Tyrande : Interrupt Stardust and blow your cooldowns at 30%. If you're ranged, don't get close to her.
Echo of Jaina : Avoid big white blades that pop out of the ground.
Echo of Baine : Throw his totems back at him. If he stomps an island that you're on, swim to a new one quickly.
Murozond : Stay out of big golden circles, stay out from in front of him, stay away from behind him, and pop your cooldowns whenever time resets.
Well of Eternity
Peroth'arn : Stay out of green stuff on the ground, and don't let the eyes get close to you when you're stealthed.
Queen Azshara : Kill the puppet strings on Mind-Controlled players as quickly as possible, and avoid bad stuff on the ground. You HAVE to interrupt Azshara's Total Obedience ability.
Captain Varo'then and Mannoroth : Stay out of bad stuff, focus on Mannoroth once Varo'then's dead, and keep adds off your healer and Tyrande.
Hour of Twilight
Arcurion : Interrupt Hand of Frost, kill Ice Tombs, and stay out of bad.
Asira Dawnslayer : Stay out of Smoke Bomb and on top of the light circles left by Thrall's totems. If you're a caster or healer, try to keep the tank or Thrall standing between yourself and Asira.
Archbishop Benedictus : Spread out, dispel Righteous Shear/Twilight Shear, interrupt Smite/Twilight Blast, and stay out of waves.
C'est en anglais, mais pas trop compliqué^^