Bellegarde's Belligerent Turning

You attempt to interrupt a creature in the process of casting a spell, turning their own spell back on them. If the creature is casting a spell of 4th level or lower, their spell is reflected onto them. If the creature casts a spell with an attack roll, that same roll will be used upon reflection. If the creature has to make a saving throw, they make it against their own spell save DC. Any area of effect or line spells will be centered on the creature casting the spell, and any other creatures within the spell's area still must make saving throws as usual. If it is casting a spell of 5th 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 is turned.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the interrupted spell is turned if its level is less than or equal to the level of the spell slot you used.