Slippery Eel

If you take damage from a melee or ranged attack, as a Reaction you may allow yourself to be flung backwards or to the side, thereby lessening the impact. If you make an Acrobatics or Athletics check equal to the enemies damage roll, you suffer only half the damage, if you roll greater than it, you dodge and take no damage at all, and on a natural 20 you dodge completely and can use an available bonus action to strike them for weapon melee slashing damage. You’re moved 10 feet away from the source of damage on use.