Hissing Stone

A stone block with a creeper face on it. Can be crafted with 2 gunpowder, 1 pure stone block, 1 red stone dust, and 1 tripwire hook. When walked on, it will explode causing damage(from 1-4 hearts) but it will not break any blocks(including itself) making it a reusable. it will constantly explode every 2 seconds while an entity is standing on it.

I am open to other ideas such as it being found underground(as a troll block) or in the nether. The idea is inspired by the magma block and I feel like this idea may add uniqueness and a bit more surprise to the game.