[Ishap]

Midkemia has the Dark Path for Moredhel (for those unfamiliar with the lore of the Riftwar Saga, the Dark Path is followed by the Moredhel race, who seek to claim the evil magical power of the Valheru Dragon Lords that once ruled the universe). Anyway, in terms of game mechanics, they can draw on this dark power in places where it lingers, which acts as a fairly powerful self buff for a period of time. However, they become more addicted the more they draw on it, and eventually will suffer withdrawals if they don't keep using it.