Reaver (5e Feat)
From D&D Wiki
Prerequisites: Constitution 13 or higher
Your love for battle and bloodshed overwhelms you in combat. As blood drains from your wounds and exhaustion overwhelms you, your enemies can see a ferocity in your eyes like no other and a malicious grin across your face.
- Once per turn, while your current hit point total is equal to or below half of your hit point maximum (rounded down), you may add your melee weapon's damage dice to the damage roll of a successful attack.
- For every stack of exhaustion you suffer, your attack roll is penalized by 2, but you may add your melee weapon's damage dice to the damage roll of a successful attack.