Counter Spell

You interrupt a creature attempting to cast a spell, make a spell attack, or perform a magic action, magic bonus action, or magic reaction. For this purpose, a magic action is any action that includes the word “magic,” “magical,” or “magically” in the description of that action.

Make an ability check using your spellcasting ability. The DC equals the save DC of the target’s most powerful ability. If the target does not have a save DC, the DC equals 8 + the attack bonus of the target’s most powerful ability (the DM has this information). If you have 10 or more levels in the School of Abjuration of the Wizard class, you add your proficiency bonus to the ability check. On a successful check, the target’s attempt fails and has no effect.

You cannot cast this spell on your turn if you have cast a spell as a bonus action this same turn. If you cast this spell on your turn, you cannot cast a spell as a bonus action this same turn.