UPDATE: Double Damage removed, so he goes from the best, to middle tier.
If you haven't seen his skills yet, he looks insane! His Trait is Abomination so he's immune to all forms of Possession, Nightmares and Bleed.
The biggest standout for him is Eldritch Stamina:
Gains 100% Stamina,
Double Damage and an Extra Turn! When I saw this I was like wow. Not only is it one of the elite few with the DD + Extra Turn, but the 100% stamina gain is a complete General Thetys counter. He can then follow up his next turns with his 45pt Dark AoE to clear the board, or one of his strong single targets to take out a high health threat.
He also has a strong single target move to grant him Freeze immunity. After he gets this up, the only way to stop him is with Stun. If you have no Stun, game over.
Rumors are he won't be last in the maze? I would be surprised if this is true, but in either case I want him!