Prince Tortheldrin

West: library
Return to the library after Immol'thar falls to confront Prince Tortheldrin. Choose a wall for the tank's back and leave an open path for melee players to retreat from Whirlwind.

Prince Tortheldrin
Elite HumanoidTortheldrin combines Arcane Blast displacement with Whirlwind and Counterspell, so losing tank contact also leaves the group exposed to interrupted healing.
Abilities

Arcane Blast
Use the library wall to limit Arcane Blast's knockback. Pause damage while the tank recovers position rather than pulling Tortheldrin across the room.

Whirlwind
Leave Tortheldrin's nearby Whirlwind attack instead of remaining beside him through the spin.

Counterspell
Counters an enemy's spell, preventing the enemy from casting that spell again for 15 seconds. Generates a high amount of threat.
Keep the tank healthy before Counterspell can interrupt a heal; do not depend on finishing a long cast when the tank is already in danger.

Thrash
Gives the caster 2 extra attacks.
Thrash adds melee attacks. Preserve a tank defensive for a burst that lands while the healer is interrupted.
Tank- Anchor your back against a library wall for Arcane Blast and bring Tortheldrin back to the same spot after displacement. Use a defensive if Thrash arrives while Counterspell prevents the healer from completing their response.
Healer- Stand outside Whirlwind and keep the tank healthy enough to survive an interrupted heal followed by extra melee attacks. Follow the tank's wall position rather than moving into Tortheldrin's spin to shorten the distance.
Damage- Melee players should leave Whirlwind and return when it ends. After Arcane Blast displaces the tank, hold damage until they recover instead of making Tortheldrin chase another player through the library.