A Bog Crone is a loathsome and repugnant fey who dwells in marshlands, swamps, and other watery environs. It stands near 7 feet tall hunched over. It has sickly blue-white skin, long wet black hair, and jaundiced eyes. As a race they are cunning and cruel, preferring trickery over direct combat. A bog crone is a master potion maker, and its huts and caves are usually festooned with potions of all varieties. As its name suggests, a bog crone prefers to live in swampy, overgrown environs. It is also aquatic and can breathe underwater. It speaks Common and Elvish.

A bog crone uses the terrain of its marshy home to its advantage. It is capable of moving in near-complete silence while in swampy terrain, surprising opponents on 1-4 on 1d6. A favored tactic of a bog crone is to surprise a single opponent and drag them away into a deep pool of water, where it then drowns the individual. A bog crone exudes an aura of unwholesomeness. Near its lair animals grow sick and die, plants wither, and water turns foul. This aura of evil even effects magic; any healing spell cast upon a target that is standing within 30 feet of the crone only heals half the normal amount.