I set out to camp this NM via a long night of farming- grabbed a few stacks of cabbage for Habitrot (not a bad way to kill time between PH spawns), cleared out my inventory, and headed out as a SAM75 /thf. Because I had a full night of farming planned, I killed one round of PHs and Terberry spawned on the next rotation.
He didn't pose any problems to me whatsoever since I engaged before he could summon an avatar. His melee hits were connecting for 60-94 a swing, and his Astral Flow (Titan) did all of 284 damage. 1/1 on the drop, and one unexpectedly short trip to Ugly Pie^^