Disclaimer: I don't own Monster Girl Encyclopedia or the other series, as they belong to their respective creators.
Undead Inucbi are a type of incubus who are, well, undead.
They are usually formed when a necromancer mamono or mamonos who know necromancy revived them to be their husbands.
What separates them from the regular incubi is that they typically do not feel hunger or fatigue. However, they still sleep or eat from time to time due to enjoying the act of sleeping and the taste of food despite not needing either.
Despite being undead, they retain their intelligence and sense of self once resurrected. In the case of former Heroes or those with special abilities who died, they still have their capabilities and abilities from when they were alive.
It is worth noting that former Heroes who have been turned into undead incubi get more powerful due to the fact their mana has been upgraded after their resurrection. Undeath has also greatly increased their physical strength and resilience, as is the case with most undeads.
Like regular incubi, the undead incubi are capable of copulating without running out of stamina or semen. However they are much more durable than the regular incubi due to their status as undeads. There was even one documented case of an undead incubus being stabbed through the heart and surviving.
The reason for the undead incubus's existence is due to Hel wanting to give men a new chance at life. This also works in favor of the Newest Demon Lord's plans to secure peace between humans and monsters as those revived as undead incubi get to be happy once more with their wives and families.
Undead incubi are usually located in regions where undead monsters thrive. Though most of them are located in tombs, cemeteries, and places of interests that are occupied by the Necromancy Sabbath.
The act of reviving an undead incubus is, by itself, a hard task as it requires a lot of effort. However they can be resurrected through a ritual that borrows divine power from Hel herself in order to resurrect an undead incubus. Though it's worth noting that the Necromancy Sabbath has been working on a solution that allows for easier revival of undead incubi in cooperation with Hel herself.
An Undead Incubus has differently colored skin, as well as a few scars, stitches and bandages that represent how he died.
A/N: So here's the Undead version of the incubi with how they are formed and how they are different from a regular incubus. And now we have three variants of the incubus, the regular type, the undead type, and the hell type.
It was stated in Monster Girl Encyclopedia II that husbands for mamanos can be revived and, in this chapter, I wanted to flesh out how they are not only resurrected but also further flesh out the role the Necromancy Sabbath has in the creation of Undead Incubi.