Mancubus/Doom 3

The Doom 3 equivalent of the Mancubus is more elephant-like, with what appears to be a trunk extending from under the eyes and into the chest and “tusks” on each side of the “trunk”.

Like the original version, it has a fireball launcher for each arm, but unlike the original, it does not fire the two launchers simultaneously, firing each in turn instead. The Doom 3 Mancubus is tougher than its classic version, taking as many as six direct rocket hits to kill, making it the toughest (but also one of the slowest) non-boss creature in the game. Furthermore, unlike the classic Mancubus, the Doom 3 version has a melee attack: both of its launchers are used as hammers.

These monsters are usually accompanied by Cherubs. This has lead to some believing they are the offspring of Mancubii.

Trivia
If the Mancubus model is examined more closely (e.g. using the noclip cheat or a model viewer) it is possible to see hooks with suckers where the trunk begins, suggesting the trunks are actually tentacles. This could indicate that the design of the Mancubus was inspired by Cthulu, like much of Quake.