Necromancer's Cuff (Patreon)

Wondrous item, uncommon (requires attunement)

The fingers of this dark silver ear cuff move to gently hold onto your ear. While wearing it, undead creatures can always understand the literal meaning of any language that you speak. In addition, you gain 3 temporary hit points whenever a living creature within 30 feet of you is slain. You can gain these temporary hit points even when you have 0 hit points: when you do, you're immediately stabilized, but are still unconscious.

Those who make themselves known in the halls of the dead—whose hearts and mother tongues have long since been worn to dust—may find themselves surrounded by ears more receptive than the ones worn by the living.