Settlements, Slumbering Monster
The settlement is home to some form of powerful and ancient monster- a slumbering behemoth, a dark god imprisoned by magical means, an ancient war-robot kept in stasis, or some other, currently inert threat. The inhabitants of the settlement expend vast effort keeping their monstrous prisoner contained, and by doing so, they have developed an impressive mastery of arcana.
At the Gamemasters discretion, the slumbering monster might be awakened. Doing so removes this quality, and afflicts the settlement with the Hunted disadvantage instead. The slumbering monster must either be destroyed or re-imprisoned by PC actions to restore this quality to the settlement.