Shadehorror Phantasm

Final boss in King's Breach.

Relatively simple boss fight that is healing intensive; the boss will periodically cast an AoE Void Bolt attack that is uninterruptible and hit everyone for large amounts of damage.

At various intervals throughout the fight he will become invincible and summon a large number of adds. These will attack target, and the tank should be ready to pull them off the rest of the party.