"This is interesting!" Gaven immediately became interested; this is clearly necromancy!
Upon reflection, this is not surprising.
Bal, along with Bane and Milkau, is known as one of the Three Gods of Death. They not only control divine positions closely related to death, but once divided the divine offices of death and the deceased among themselves. Bal particularly likes using undead armies to facilitate more murders.
After Khan Yamen absorbed Bal's old followers, he immediately activated this ability, organizing a massive vanguard army of the undead to assist in attacking Tavelan City.
Gaven now merely inherited this ability in due course.
This isn't Slaughter Devouring Evolution, but a conventional Slaughter Divine Power blessing, transforming them into his skeleton soldier subordinates.
Alone and isolated here, Gaven felt no sense of security, and could entirely use this ability to build an undead army for himself.
