Mage Slayer

4th Level Feat, Proficiency with Any Martial Weapon

Repeatable: No   You have practiced techniques useful in battlingmagic-users, gaining the following benefits:   Ability Score Increase. Increase your Strength or Dexterity score by 1, to a maximum of 20.
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 Long Rest.