Boxed with 6 65's: DRU ENC WIZ MAG CLE SK
Spin-stun is annoying, for sure, the tank loses aggro. So whoever is 2nd on hate list has to be able to survive until tank recovers. Sitting and standing quick stops the spin but not the stun.
He's a cleric, supposedly, but we didn't see any CH attempts.
He appears to have about 326k HPs, which would put him below the 400k+ of the other tower bosses.
Damage by group members:
Wiz 94k
Mag 86k
Dru 67k
SK 62k
Enc 17k (was out of range for part of fight, until I noticed.)
Did not attempt to charm a giant, as this boss dispells.
Cleared the 4 potential adds on the boss's platform to avoid risk. They can all be pulled singly.