Spell Siphon

7-level Abjuration

Casting Time: 1 reaction, which you take when you see a creature within 60 feet of you casting a spell

Range/Area: 60 feet

Components: S

Duration: Instantaneous

You attempt to siphon the energies of a spell in the process of being cast, interrupting and taking the arcane power for yourself. If the triggering creature is casting a spell of 5th level or lower, its spell fails and has no effect; if it is casting a spell of 6th level or higher, make an ability check using your spellcasting ability. The DC equals 15 + the triggering spell’s level. On a success, the triggering spell fails and has no effect. If the triggering creature’s spell fails, you regain an expended spell slot of the failed spell’s level or lower.

At higher levels: When you cast this spell using a spell slot of a level higher than 7th, you can automatically siphon a spell of a level higher than 5th without needing to make the ability check: a spell of up to 6th level when you cast this spell using an 8th level spell slot, and a spell of up to 7th level when you cast this spell using a 9th level spell slot.