Spawns all the way in the underwater section of Icewell keep at the Great Divide one way zone out.
To get to this spot, drop off first bridge in from Thurgadin and zone into Icewell Keep, then fight your way all the way to the west as there are a mixture of mobs that can and can't see through invisibility. When you come to the first and only turn, keep going west (left).
Mob will spawn in the underwater section and can agro through the ice.
PH is a "Frosticube" and has a respawn time of 48 minutes and 15 seconds. I recommend camping it from the empty room prior to the "Coldain Outcasts" near the Great Divide one-way zone out.
Edited, Jan 14th 2023 2:05pm by Sporky
Edited, Jan 14th 2023 2:07pm by Sporky