Cross the Invisible Bridge ... Go SOUTH till the last tunnel on the right ... hug the RIGHT wall till it dead ends... there will be 4 mobs .. either all TH's or He'll be up inthe mix the 1 in the middle is his PH. His exact spawn point is NEG -351 POS+1378 .. The ring is his common drop .. Spawn cycle I think is 23min
I found his location at around -325, +1375. Post this in thedeep_1.txt (great idea Melkiah): P -1374.9443, 342.7429, -61.9333, 0, 0, 0, 3, Thought_Horror_Corrupter
from looking at the pic, I'd have to say that he spawns at the deadend at top of the ramp at what is commonly referred to as the shard camp. of course, there are other deadends with blue rocks, but I'm pretty sure that's where he is. paste the following to your thedeep_1 map. should give you a good idea where to start, you'll see the deadend near the shard camp.
P -1371.0000, 691.0000, -59.0000, 0, 240, 0, 3, VT_shard_camp