Improved Swift Banishment

You easily banish creatures with your weapon. You can use as long as you have a spell slot of 5th rank or higher remaining, even if you don't have prepared. You must sacrifice a prepared spell of 5th rank or higher, and the banishment effect you create is heightened to the rank of that spell. The target takes a –2 circumstance penalty to its save as though you'd paid the extra cost for banishment.