First of all
this is a very cool spell, but here are some things that I think should be changed because they make no sense.
1. Detonate should work on undead. I see nothing in this spell’s description or fluff that would suggest why you can blow up a person’s body, but not a zombie/skeleton’s body. This spell should work on any corporeal creature.
2. The death descriptor should be removed from this spell. This is not death magic. It should not have the death descriptor. If implosion is not death magic, why would this be? Both spells crush/manipulate the targets body. The death descriptor should be removed.
These are two modifications that I think should be made to the 9th circle detonate spell.