Emperor Dagran Thaurissan

The Imperial Seat
Clear the throne-room guards before engaging the Emperor. Moira fights alongside the Emperor. Assign someone to stop Moira's healing, keep incidental damage off her, and defeat the Emperor first if you intend to speak to her afterward.
Emperor Dagran Thaurissan
Elite HumanoidThe Emperor combines Avatar of Flame's magic immunity and added attack damage with Hand of Thaurissan's stun while Moira tries to heal him.
Abilities

Avatar of Flame
Stop offensive magic against the Emperor during Avatar of Flame; physical attackers can continue while casters help stop Moira's healing.

Hand of Thaurissan
Inflicts Fire damage to an enemy, stunning it for 5 seconds.
Keep the current victim healthy for Hand of Thaurissan's Fire damage and stun rather than relying on them to use a defense after it lands.
Tank- Save defensive resources for Avatar of Flame's added Fire damage and keep a health margin for Hand of Thaurissan. Hold the fight away from Moira's interrupt player rather than forcing them to chase her.
Healer- Increase tank coverage during Avatar of Flame and keep the victim of Hand of Thaurissan alive through the stun. Watch Moira's interrupt player so her healing does not prolong the Emperor's dangerous periods.
Damage- Physical attackers should keep pressure on the Emperor during Avatar of Flame. Casters should stop offensive magic into the immunity and help interrupt Moira without killing her if she is being spared.