yessir! Just this minute killed him after killing all the bloods in the zone. However the only bloods in the zone were on the stairs to nowhere (furthest east and middliest part of the zone). He spawned at the very top of the steps.
Confirmed for me today -- spawned in two places. Basically, any 'blood of vergalid' is a ph for it.
There are 2 "nooks" in the large cavern i described earlier on the south/east side of the larger room. Both rooms have nothing but 'bloods' in them and any can spawn the Unearthed Mass. Where the bloods are pinkish color, the Unearthed Mass is much larger and grey in color.
I had it spawn from another blood. Been camping this area for serveral hours clearing everything. The blood at the top of the stairs and one below and to the left where both up and I figured another round of ph. Track said otherwise. It spawned around the corner where there's 3 more blood's.
I'd recommend you kill all the blobs and hope for the best.
Pulled him toward the spiral area and he got stuck at the base of the stairs, like an iceberg with most of his mass under water and just the tip and his name poking out. Kinda of an "under the world" situation. Any attempt to pull, whether with a spell or direct melee received an "unable to see your target" message.
Then I sent in the mage pet to pull. The pet got aggro and I backed off the pet, classic ole-style pet pullin'. Unearthed Mass moved from the stuck spot but then... I lost sight of him.
You know that sickly feeling you get as a puller when you tag a mob and it doesn't follow you directly and you lose sight of it?
We evac'd just in time to avoid the 20-ish train!
The train included the Unearthed Mass, though, and since it's a corpse-camper, when we returned he was right there waiting for us, all alone.
Drops truncheon of blood Clr only required 68 recomended 75 1hb 24 dam 28 delay 21 ac +12 dex str sta wis agil +14 fire disease cold magic +205 hp and mana
I found him in inner Vergalid right after you pass through the keyed door. He may be a random spawn and/or he may have been pulled there. He looks like a rock or grey slime ball.
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"Citing your sources isn't spoon feeding, it's basic 101 if you're making an argument."-Jophiel
He corpse camps, so he was pulled there, his spawn point is at the top of a stairwell that leads nowhere, down a path left of the keyed door. He dropped a nice cleric 1 hander with 200+ mana/HPs called Truncheon of Blood