The Eyrie is the smallest of the great castles in the story, consisting of seven slim towers bunched tightly together. It has no stables, kennels, or smithies, but the towers can house 500 men, and the granary can sustain a small household for a year or more. The Eyrie does not keep livestock on hand; all dairy produce, meats, fruits, vegetables, etc., must be brought from the Vale below. Its cellars hold six great winches with long iron chains to draw supplies and occasionally guests from below. Oxen are used to raise and lower them. Winter snows can make supplying the fortress impossible. The Eyrie's dungeons, known as "sky cells", are left open to the sky on one side and have sloping floors that put prisoners in danger of slipping or rolling off the edge. Executions in the Eyrie are carried out via the Moon Door, which opens from the high hall onto a 600-foot drop.