Bloodmage Thalnos

Graveyard
Use the leftmost wing entrance. Clear the interrogation rooms around Vishas, then follow the passage into the cemetery. Descend into the crypt for Thalnos, clearing its occupants before starting his fire attacks in the confined room.

Bloodmage Thalnos
Elite UndeadThalnos combines a nearby Fire Nova with targeted Flame Spike burns and Shadow Bolts in the crypt.
Abilities

Fire Nova
Inflicts Fire damage to nearby enemies.
Keep ranged attackers and the healer away from Thalnos's nearby blast; melee players should recover health before closing in again.

Flame Spike
Spread around the crypt so Flame Spike's selected area does not burn the group together. Keep healing players carrying its burn.

Flame Shock
Heal both Flame Shock's initial hit and its continuing burn; leaving Fire Nova's reach does not end this damage.

Shadow Bolt
Hurls a bolt of dark magic at an enemy, inflicting Shadow damage.
Keep Thalnos's target in healing range even when the healer stands back from Fire Nova; Shadow Bolt still reaches a distant target.
Tank- Clear the crypt before engaging Thalnos and keep the fight where the group has room to spread for Flame Spike. Maintain the healer's sightline when moving near the crypt stairs.
Healer- Stand back from Thalnos to reduce Fire Nova exposure. Watch Flame Spike and Flame Shock burns alongside the targeted Shadow Bolt damage; a player who has stepped back may still be taking a burn.
Damage- Spread for Flame Spike instead of stacking beside the healer. Attack from outside Fire Nova's reach when your weapon or spells allow it, and recover before returning to melee.