Justice is a fan-made global mod.

What about renaming the succubi?

That's not a good idea. It's better to keep "succubus" as the base name, because if we consider the meaning of the word "succubus" and the type of unit we have, we can say that all three are succubi, and the upgrade and alt-upgrade are just their different forms/evolutions. For example: succubi/lilim/tempters.