Bloatbomb

Necromancy [acid, death]
Level: Antipaladin* 4, Artificer * 4, Cleric */Oracle * 4, Sorcerer */Wizard * 4
Components: V, S
Casting Time: 1 Standard Action
Range: touch
Target: living creature touched
Duration: instantaneous and 1 minute/level (see text)
Saving Throw: Fortitude negates or Reflex half, see text
Spell Resistance: yes
  The target creature dies if it fails a Fortitude saving throw and its Hit Dice are no more than half your Caster Level.
  If it dies, its corpse rapidly putrefies. The next creature to touch the corpse within 1 minute per level of the target's death causes the corpse to explode in a 10-foot-radius burst, dealing 3d6 points of acid damage (Reflex half).