Mortal Bulwark

20th-level Oath Of The Watchers Feature

You manifest a spark of divine power in defense of the mortal realms. As a bonus action, you gain the following benefits for 1 minute:

• You gain Truesight with a range of 120 feet.
• You have advantage on attack rolls against aberrations, celestials, elementals, fey, and fiends.
• When you hit a creature with an attack roll and deal damage to it, you can also force it to make a Charisma saving throw against your spell save DC. On a failed save, the creature is magically banished to its native plane of existence if it's currently not there. On a successful save, the creature can't be banished by this feature for 24 hours.

Once you use this bonus action, you can't use it again until you finish a long rest, unless you expend a 5th-level spell slot to use it again.