Banishing Arrow

This arrow looks to be a large spiked hoop on the end of an arrow shaft - though, out of the corner of the eye of whoever looks at it, there's something odd about the way things are seen through that hoop...

Whenever a creature takes damage from this kind of Arrow, they must make a DC 17 CHA saving throw, or be banished per the Banishment spell. A creature that succeeds on its saving throw takes 6d10 Force damage, and has disadvantage on the next CHA saving throw it makes to avoid being banished.

Notes: Damage: Force, Damage, Banishment, Combat