[Ding! Congratulations on obtaining: Forbidden Technique - Divine Blood Prison! (Red Quality)!]

[Divine Blood Prison: A secret killing technique of the Ancient God Clan, where divine blood transforms into a prison. Its power depends on the amount of Ancient God blood sacrificed. Since using this secret technique requires sacrificing one's own Ancient God blood, it is generally not used unless in a life-or-death situation and is considered a forbidden technique.]

Huh?

It requires sacrificing Ancient God blood?