When you take damage or use your Undying Conviction, you can convincingly fake your death. You teleport up to a known location within 10 miles of you at the same time that a duplicate corpse appears to take your place. The corpse is indistinguishable from you and wears nonmagical duplicates of your clothing and equipment. You can choose for the corpse to realistically bleed, mutter incoherently, and breathe shallowly for up to a minute. The corpse is unaffected by spells and other magical effects. The corpse and its clothing and equipment vanish after 10 days, or when you dismiss it as a Magic action or use this feature again.
Furthermore, if you covertly notify the GM, you can also convince other players of your death. You can roll Death Saving Throws as normal, ignoring successes, temporarily prepare a new character sheet, and so on.
Once you use this feature, you can't use it again until you finish a Long Rest.