Perishing Ocarina

Wondrous item, very rare (requires attunement)

This bone ocarina is carved in the shape of a skull and has playable holes that correspond to different body parts. The sound it makes is soft but haunting. You can use an action to play the ocarina to cast the blindness/deafness spell from it (save DC 16), covering the relevant holes on the skull for the effect you create. The target automatically succeeds on the save if it can't hear the ocarina. This version of the spell allows you to choose from the following additional options if the target fails its save, instead of causing it to be blinded or deafened: the target is muted for the duration or its concentration is broken. A creature muted in this way can't speak or perform the verbal components of spells.

Perishing Song. You can use an action to play this ocarina while covering all of its holes. When you do, each creature within 30 feet of you that can hear the ocarina (including yourself) must make a DC 16 Constitution saving throw. On a failed save, a creature is cursed by the ocarina for 1 minute. For the duration, each cursed creature must make the saving throw again at the end of each of your subsequent turns. A creature that fails this saving throw for a second time after the initial failed save falls unconscious with 0 hit points and is stable. A creature is no longer cursed in this way once it succeeds on the saving throw for a second time. Once this property is used, it can't be used again, and the ocarina loses this property once the curse ends on the last creature.

You will suffer first the merest touch of oblivion, a song to lull you into the sightless and soundless, stretching an eternity yet near enough to be just beyond your fingertips.
Then a deeper darkness, a weight that is at once uncountably greater and all the more infinitely close.
From that, I will bring you to the final end. That death will be dark, and quiet, and gentle beyond imagining as the song, too, dies.