The Ballistic Bomb

Summon a 2 foot tall helper to self detonate near a target of your choice. Once spawned, the helper will immediately start looking for the target in a 60 foot radius to run and detonate near. If the helper can't find the target in less than 2 minutes, it automatically detonates. The target must make a Dexterity Saving Throw of 15. On a failed save, the enemy takes 3d10 bludgeoning damage and is knocked prone for 2 rounds. On a successful save, the target dodges the explosion and takes only 3 points of damage.The helper has an armor class of 4 and a health of 8 and will explode if killed.