Unmisable Rock

you pick a small rock either from the ground or in your possession and imbue it with a magical aura. for the duration you can use an action to throw the rock at a target, it automatically deals 1 bludgeoning damage to the target ignoring resistances and immunities. if a creature were under full cover or cast the shield spell, the spell misses and no damage is dealt. if the target were to be reduced to zero hit points, you can choose that instead of killing it, it only become unconscious.

This spell's damage increases to 2 when you reach 5th level, 3 at 11th level, and 4 at 17th level.