Hammer Fist (5e Feat)
From D&D Wiki
Your fists are like sledgehammers, and they can be used to deliver crushing blows. You gain the following benefits:
- Increase your Strength score by 1.
- Your unarmed strikes deal 2d4 + Strength modifier damage on a hit.
- If you have the martial arts feature, you add 1d4 to the damage done by your unarmed strikes.