The shadow power source represents the power of the Shadowfell. Few creatures embrace shadow energy without a compelling reason and a measure of desperation. To claim and wield the power of shadow, one must pledge a shard of his or her soul to the Shadowfell. This soul fragment is replaced with a dark reflection of one's true self, which becomes the source of shadow powers. Shadow abilities are called hexes.
Classes that draw power from the shadow power source are:
- Warlock (some pacts, like the Binder)
- Wizard (those who practice the Necromancy and Nethermancy schools of magic)
Shadow classes and powers were introduced in the Dragon Magazines.