Dowr's Explosive Pebble

You touch a rock no larger then what you can fit in your hand. When doing so the rock vibrates and becomes volatile for 10 minutes, after the 10 minutes the spell end. Throwing the rock causes and explosion of a 50 foot radius , on a failed save a creature is moves 10 feet back. The rock deals 2d8 force damage to its target, and half as much on a successful save.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the spell creates one more explosive rocks for each slot level above 1st.