The Mindbender's Appetite

You interrupt a creature in the process of casting a spell. If the creature is casting a spell of 3rd level or lower, its spell fails and is consumed by the Mindbender's Conflux. If it is 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 is consumed by the Mindbender's Conflux restoring 1 charge point for each level of the spell consumed.