Spirit

The spirit is a blue, ghostly version of the summoner from Doom (2016) which is slated to appear in The Ancient Gods, Part One, the first expansion for Doom Eternal.

It has been seen bursting out of slain demons that give off a distinctive blue glow while alive. In the trailer, it is seen emerging from a slain tyrant to possess a soldier which immediately starts glowing in the same way. According to Hugo Martin, the possessed demon becomes immune to ballista damage and its weak points (if any) are rendered unbreakable. The player must kill the demon first to release the spirit and then eliminate it with the plasma rifle's microwave beam mod before it can find another demon to possess.

