Actions Reaction (Somatic Casting)
Trigger A creature within range that you can see casts a spell.
Range 120 feet; Targets the spell cast by the triggering creature
You undermine the target spell, making it easier to defend against.
You reduce the spell’s level by 1, and targets gain a +1 conditional bonus to any saving throws, skill checks, AC, or DC against it.
You can’t reduce the spell’s level below its minimum (if any).
For example, a 5th-level cone of cold would remain 5th-level, but a 5th-level fireball would become 4th-level.