The Black Feather Fort is a Daern's Instant Fortress currently located several miles south of Rilan. The fort is owned and controlled by Eingrim the Gold, an aetherist of Lok Magius knighted by the Lord of Rilan.

The fortress was originally built as a small holding for giants, with thirty foot ceilings, twenty foot doors, and room enough for nine giants and a dozen slaves. In historical literature, it was the center of the ruins of Drbth, a enclave of giants in the forests to the west of Rilan. The enchanted fort had accumulated enough energy by the fall of 1333 to be shrunk, moved, and reenlarged one more time.

Over the winter of 1333 to 1334, the fort was remodeled to more human sizes, with additional floors built in. The slave pens on the bottom floor were converted to stalls for mounts, and the slave pens on the second floor were converted to a storeroom and treasury. On each floor, three of the four giants' cells were converted to two-story rooms, while the fourth (the one farthest down the hallway) was converted to three-story rooms.

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