The Lost Soul is a flying demon skull and a returning monster in Doom (2016). It first appears in Kadingir Sanctum.
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These demons are found wandering aimlessly within the temples of Hell as they search for a host to inhabit. When a potential victim is found, they will converge on the target and explode with a blast of Hell energy. Lesser-willed beings weakened by the explosion will then be possessed by the demon and the host's soul becomes lost in turn. Tablets revealed from the Corrax suggest the Lost Souls are considered the lowest of the demons- even lower than Imps. Since the wandering nomads, doomed to forever roam the Halls of Hell, thrive on the weakest entities, Lost Souls are despised by other demons. Despite their lowly status, they should not be underestimated.
The Lost Soul bears a very stylised rendition of its first appearance in the original Doom. Simply put, it is a large, flaming skull with red eyes and large horns. The only tissue that can be seen is within the Lost Soul's mouth, which also bears sharp, pointed teeth.
The Lost Soul has two stages. The Lost Soul will burn blue when calm and will float aimlessly around the area. When it spots the player, it will become aggressive and will burn red. In this stage, it will charge towards the player with great speed while letting out a high pitched shriek, similar to its attack in the original Doom. While charging, it will attempt to hit the player and explode, dealing great damage.
The Lost Soul is a very weak, but fast monster. It is wise to pick them off while they are in their calm stage, using the Pistol's charged energy shot as it saves ammunition and will usually kill the Lost Soul with one shot. Furthermore, the player should keep watch for any Lost Souls in the area, as they can easily spot the player without them realising it and charge into the player before they can attack. Only one lost soul can attack at a time. This makes it a lot more easier to dispatch a group of Lost Souls. They are the only enemy which cannot be Glory Killed.