Mage Slayer

You have practiced techniques in melee combat against spellcasters, gaining the following benefits:

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

• When a creature which is within reach of you casts a spell, you can use your reaction to make a melee weapon attack against that creature.

• When you damage a creature that is concentrating on a spell, that creature has disadvantage on the saving throw it makes to maintain its concentration.

• You have advantage on saving throws against spells cast by creatures within your reach.