Undead Non-living Bomb

You target an area in range you can see of 10 feet, causing your spores to react. All the Undead that are currently under your control in that area suddenly explode in a 20feet diameter area, causing 3d10 necrotic damage for each corpse that exploded. All the creatures caught by the explosion must take a DEX Saving Throw, and take half damage on a successfull save.
If the explosion hits a dead body or a pile of bone, the spores will infect that and immediately explode, adding another 1d10 damage.
At higher levels: If you cast this spell with a spell slot of 4th or higher, it deals 1d10 bonus damage for each slot level above 3rd.