Mage Slayer

Mage Slayer
Feat
Prerequisite: Level 4

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: Player's Handbook (2024) (XPHB), page 205