Warlock Punch

You call upon your patron to infuse your muscles with a fraction of their power. You then channel all this power into your first and unleash it in one large burst. 

The damage of this spell changes based on your patron.

Make a Melee Spell Attack against a target within range. On a hit the target takes 2d8 + your spellcasting mod as damage of the type associated with your patron. The target must then make a Strength Saving Throw against your DC,  being pushed back 5 feet and knocked prone on a failure. 

The damage types per patron are as follows: 

Fiend: Fire

Archfey: Poison 

Great Old One: Psychic

Celestial: Radiant 

Undead & Undying: Necrotic

Fathomless: Cold

Genie: Efreeti-Fire, Marid-Cold, Djinn-Lightning, Dao-Bludgeoning

Hexblade: Force

At higher levels: The damage of this spell increases by 1d8 and the distance pushed increases by 5ft. for each spell slot level above 1st.