Counterspell

Counterspell is a magical ability used to interrupt or negate another spell being cast. When a spell is cast, a wizard with counterspell can use their reaction to attempt to stop it before it takes effect. If successful, the original spell is negated, preventing its effects. It requires the caster to recognize the spell and have the reaction available at the right moment. Essentially, counterspell acts as a magical "pause" button that can prevent an opponent’s spell from occurring, making it a powerful tool for controlling the flow of magical combat or interactions.