Sunstone

Akakios spills forth from his bags a wealth of gemstones and coins, into a large earthenware bowl painted with scenes of dark figures on dark backgrounds, like goblins beneath the earth. "I have a customer," he says, turning his lambent gaze from the bowl to the bargainers, "Who seeks to add to the gloom of his demesne. Would you be willing to trade your shadow for this pile of wealth from his realm?" He reaches down to select a single orange gem from the pile, which begins to glow brighter as he lifts it. "This one in particular he was eager to be rid of."

Akakios is seeking to trade a pile of gems and coins, including one magical gem, for a mortal's shadow. While mundane wealth is often not a need of magi, one gem in particular is a magical sunstone. Agreeing to the trade would, obviously, mean the bearer can cast no shadows. They also will generally begin to become paler as a consequence of their lack of interaction with the sun.

Sunstone of the Earth: This is a large gem, larger than most become naturally, as it is pulled from a faerie realm. The stone is uncut, but reflects light radiantly. It seems to glow brighter, the darker the surroundings are. The sunstone casts stark, dark shadows (for those who do cast shadows) and can often make it very easy to find invisible things. The glow of the sunstone, on a moonless night, is bright enough to fill an amphitheater with bright light comparable to a summer noon.