General Feat (Prerequisite: Level 4+, Strength or Dexterity 13+)
You gain the following benefits.
Ability Score Increase. Increase your Strength, Constitution, or Dexterity score by 1, to a maximum of 20.
Disruptive. Immediately after a creature within your reach takes the Magic action or begins casting a spell, you can make an Opportunity Attack against that creature.
Spell Counter. When you hit a creature that is casting a spell with an Opportunity Attack, the creature makes a Constitution saving throw (DC = 8 + your Proficiency Bonus + the modifier used for the attack). On a failed save, the spell dissipates with no effect, and the action, Bonus Action, or Reaction used to cast it is wasted. If that spell was cast with a spell slot, the slot isn't expended. If you have the Mage Slayer feat, this Constitution saving throw is made with Disadvantage.
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