Concussive Stone

You take one of your previously magically imbued stones, and overcharge it, granting it force far beyond what could normally be achieved, before hurling it at your target.

You or someone else can make a ranged spell attack with one of the pebbles by throwing it or hurling it with a sling. If thrown, it has a range of 60 feet. If someone else attacks with the pebble, that attacker adds your spellcasting ability modifier, not the attacker’s, to the attack roll. On a hit, the target takes 4d12 bludgeoning damage and must make a constitution saving throw or be or stunned until the end of their next turn. A creature that succeeds on the save is not stunned.

This effect lasts one minute, after which the effect ends if it is not used.

 At Higher Levels. When cast using a spell slot of 4th level or higher, the damage dealt increases by 1d12 per level of spell slot used.