Arcane Mine

3 arcane shards are planted close to the surface and are hidden from the DM. If stepped on the Mine, each creature in a 10-foot-radius sphere centered on that point must make a Dexterity saving throw. As a Bonus Action you can activate one or all of the Arcane Mine's but a creature can only be damaged ones at the same time. A target takes 3d6 force damage on a failed save, or half as much damage on a successful one. (this spell only works on a battle map)

The shock wave spreads around corners but not more then 10ft. It can be heard in a 300-foot-radius.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.