Forgotten One

The Forgotten One's form is an echo of the original Lost Soul's shape in the previous Doom games, rather than its interpretation in Doom 3. It is a flying skull with two demon horns, and floats with a stream of flame behind it. Its only attack consists of flying towards its enemy and biting. It replaces the Doom 3 incarnation of the Lost Soul in the expansion pack.

Due to the lack of melee weaponry, these enemies are much more difficult to eliminate from the original. As in Doom 3, the use of the chainsaw or weak weaponry can result in immediate death, however this incarnation has the potential to withstand a standard shotgun blast from midrange.