A NetHack amulet that confers magical breathing, as the name implies. This will prevent you from being strangled or choked (as from a rope golem or other choking creature), and will allow you to breathe underwater. Eels will not be able to drown you.

This amulet produces no messages, so it can be difficult to identify. They are also fairly rare -- wearing random amulets is still very dangerous due to the possibility of an amulet of strangulation, amulet of change, or amulet of restful sleep.