Mercy (5e Feat)
From D&D Wiki
You have a peaceful approach to combat. You gain the following benefits:
- When you make an attack that would've reduced a creature to 0 hit points, you can spare the target. When you do so, the targets attitude towards you becomes indifferent, if it was hostile and friendly, if it was indifferent, and you have advantage on all Charisma checks you make towards it for the next 24 hours or until you or an ally take any hostile conduct towards it (like attacking it or others, at the DM's discretion).
- When you hit a creature with an attack, you can choose to subdue the creature instead of causing damage. When you do so, the creature is automatically grappled and you can try to shove the creature as part of the same action.
- You can disarm a creature. You must make an attack roll contested by the target's Strength (Athletics) check or Dexterity (Acrobatics) check. If you win the contest, the attack causes no damage or other ill effect, but the target drops the item.