After opening the door to Secret Vault - Laboratories' Core, the Initiate meets with Attis and learns his plans. A pre-fight of two stages is begun where Attis, due to experimenting on himself, slowly forms into a ghastly blob. At this stage, the quests to kill Attis starts where his tentacles and some crony radbugs need to be put down. Then his weak point, the eye, can be targeted for some serious damage. This cycle repeats itself three times when finally the eye is destroyed, leaving some energy ammo.
Phase two is then started where his mouth, that is deformed into a powerful suction device, starts pulling and eventually gnawing at you at 80 points damage a gnaw. At this stage the heaviest weapons (and stimpaks) make the job easier to deal some serious damage in return. Finally, the mouth is beaten and the way back to the mutated labs Three is free.
The scattered pieces of the mutant general have grown to form this... this BLOB. You've got to hurt this creature so that you can escape. HINT: The tentacles can be destroyed, but the eyes are really its weak points.
A large portion of the blob is blocking the way out... and it's got a mouth. Blast your way through this thing. But watch out! It bites.