From Destinypedia, the Destiny wiki
Demented Abominations (also sometimes known as a SaladFork) are powerful Scorn Abominations appearing in the mission, Last Call. One of them was killed by The Guardian during in the mission, Last Call, when attempting to break through a door in the Prison of Elders for unknown reasons. Another one can seen at the The Machinist.
The encounter will start when the player travels to the area known as the Hole, where the Demented Abomination is first seen pounding on a door. The Scorn enemy won't attack until shot at. The Abomination as well as Scorn enemies will come down on the player, so adds need to be cleared as soon as possible. There is also little cover, promoting a cautious behavior. Killing this boss finishes the encounter and the player will then move on.
List of Appearances