Bloodbath

On a successful melee attack, the following successful attacks add a 5% chance to add 1D4 additional damage. This ability stacks until the character takes damage, or 2 minutes have passed since the last successful melee attack. The percentage increases by 5 with each successful melee attack, add 5% on the second strike, 10% on the third,  and so on. This feat can be taken multiple times, with each additional acquisition, add an additional D4 to the damage roll.