Cannotrip

Choose a target you can see within range. Each time the target tries to cast a spell of equal or lower level than this spell, it must succeed on a spell-casting ability check against your spell save DC or waste its spellcasting action.

At Higher Levels. The maximum level of spell inhibited by it is equal to the level of spell slot expended.

Spell-casting ability check. This is the primary stat that the target uses to cast spells.