Counterspell

You interrupt a creature casting a spell. If they
are casting a spell of 3rd level or lower, their
spell fails and has no effect. If they are casting a
spell of 4th level or higher, make an ability check
using your spellcasting ability. The DC equals
10 + the spell's level. On a success, the creature's
spell fails and has no effect.
At Higher Levels: For each extra spell slots, the
interrupted spell has no effect if it's level is less
than or equal to the level of the spell slot used.