Warlock Punch

Channels potent dark magic into one of the user's fists to attack a creature. Upon a successful hit, target takes 1d20+5 Bludgeoning Damage on top of the users Unarmed Attack, which is converted to Necrotic Damage, then is knocked back a distance of half the user's walking speed (rounded down).

Regardless of type of attack or whether a hit was successful, the user will remain immobile for the remainder of the round until the end of the following round. This includes actions, bonus actions, movement, and reactions. Can only be used once per long rest.

AT LEVEL 7
Base damage increased to Unarmed + 1d20+1d10+5.
User can now lunge at a target within 10ft.

AT LEVEL 11
Base damage increased to Unarmed + 2d20+8. Knockback is doubled.
User can lunge at a target within 15ft.
Attack Option: Slam
- Instead of punching, user grabs target and slams them into the ground, dealing Unarmed (Necrotic) + 1d20+1d10+4 (Bludgeoning) Damage.
- If attempted on a target with legendary resistances, attack will automatically fail.
- Upon success, target does a Constitution saving throw. Failure leads to them being knocked unconscious for the remainder of the round.
- If the target loses more than half of their HP, no saving throw is done and they are automatically knocked unconscious for the remainder of the round until the end of the following round.

AT LEVEL 16
Base damage increased to 2x Unarmed + 3d20+10. Knockback is tripled.
User can lunge at a target within 15ft.
Attack Option: Slam
- Instead of punching, user grabs target and slams them into the ground, dealing Unarmed (Necrotic) + 2d20+5 (Bludgeoning) Damage.
- If attempted on a target with legendary resistances, attack will automatically fail.
- Upon success, target does a Constitution saving throw. Failure leads to them being knocked unconscious for the remainder of the round.
- If the target loses more than half of their HP, no saving throw is done and they are automatically knocked unconscious for the remainder of the round until the end of the following round.
User is no longer immobilized after casting.