Mage Slayer

General Feat (Prerequisites: Level 4+)

Ability Score Increase. Increase your Strength or Dexterity score by 1, to a maximum of 20.

You gain the following benefits.

Concentration Breaker.

When you damage a creature that is Concentrating, it has Disadvantage on the saving throw it makes to maintain Concentration.

Guarded Mind.

If you fail an Intelligence, a Wisdom, or a Charisma saving throw, you can cause yourself to succeed instead. Once you use this benefit, you can't use it again until you finish a Short or Long Rest.

Source: PHB'24, page 205