So... that severed hand-snake-thing injected Will with that god's blood(instead of venom)? Ok. In short, he's going to become undead too, huh? However, since it's done without a contract, do it mean that while undead he won't be bound to Stagnate?
My current guess is that this combined with him receiving the protection or blessing of the goddess of reincarnations/transmigration/souls will allow him to not be bound to Stagnate while still being undead. Heck, maybe he'll even be able to extend his blessing(or just make use of it) to protect his family from Stagnate. That'd be cool.