Large medieval fortress (200×200×10...

Large medieval fortress (200×200×100 to 300×300×150) on a windswept, rocky island. Massive walls of weathered stone bricks, reinforced by thick oak pillars. Steep black roofs, half-timbered sections, wooden balconies, realistic medieval atmosphere. Rugged, irregular island with moss, sheer cliffs, and small beaches. Low entrance: vast gatehouse carved into the rock, oak bridges and docks. Spruce storage huts near the water, dark roofs. Multi-level main castle: thick ramparts, round towers, inner courtyards. Towers topped with black roofs and dormer windows, facades reinforced with oak beams. Imposing central keep: arrow slits, crenellations, spruce hoardings, large flags. Stone/oak/spruce palette/black roofs, warm lanterns, rough sea and stormy sky.