Self-Destruct. (Enchantment) Target: Friendly Corporeal Nonliving Creature.
Turns the target creature into a walking bomb. When the Enchantment is revealed, the caster may destroy the creature to make an Unavoidable Zone Attack in the zone the creature occupied.
Alternatively, this could be a spell you could cast on a Nonliving Conjuration, when enemies start smashing up your Monolith or Idol or whatever, Boom!