Glimpse the Dead

You can use a bonus action to see into the border ethereal. Until the start of your next turn, you can see any ethereal creature within 30 ft. of you and attack it as if it is not ethereal. Your spells and other abilities cannot affect ethereal creatures unless they specifically state they can do so. During this time, you also have advantage on Perception checks to notice hidden undead creatures that have the incorporeal movement or shadow stealth trait. You can use this ability a number of times equal to your proficiency bonus, and you regain all uses after a long rest.