Glorb spawned in the first room you come to after zoning into MMM from Steam Factory (junk room).
This mob does see through invis. Was "Slightly" slowable.
Location was +662, -370, -48 We did wipe, but I'll share what info we did collect: Our tank was a level 80 monk with 3.4k AC, 17% shielding, 98 avoidance, max defensives, improved block III, improved dodge III, 8% dodge mod.
Max hit against our tank was 4836. Average hit against our tank was 2241. He put out 1934 DPS on our tank. Max hit against a naked caster was 5063. He does quad. Doesn't rampage. Doesn't Flurry. Doesn't AE Rampage. Has no special effects.
This mob didn't miss very much...78.9% accuracy rate.
I would estimate his HP at about 300k.
Also, when I was pulling him, I noticed that none of the clockworks in the room assisted him. He might not be social, or he might be on a seperate faction.