Absent knowing anything else, and assuming most of the “usual” fantasy tropes are in place?
Either Savage Worlds, or Colville’s Draw Steel depending on how I feel and how my upcoming experimental play of the second one goes.
An actual exchange in a group my wife was in, back before we were even dating:
Player: “I wanna catch the stone from his sling! What should I roll for that?”
DM: “Damage.”