Conjure Concussion

You summon a small, dense, 6 ounce white sphere of ivory-like material. As an action, you or someone else can make a ranged spell attack against a creature within sight. If someone else attacks with the ball, that attacker adds your spellcasting ability modifier and spell save to the attack roll and saving throw.

On a hit, the target takes bludgeoning damage equal to 3d10 + your spellcasting ability modifier. Additionally, the target must succeed on a constitution saving throw . On a failed save, they fall prone and suffer a concussion, becoming incapacitated and unable to stand until the end of your next turn.

Hit or miss, the spell then ends and the sphere disappears. If you cast this spell again, the sphere disappears.