The Realm of Ooze, also called the Plane of Ooze, lay at the intersection of the Realm of Water and the Realm of Earth within the Cosmic Wheel. It was a thick, unstable expanse where liquid and solid matter blended into mud, silt, and living slurry. The plane lacked clear horizons, instead forming endless stretches of semi-fluid ground broken by deeper pools and slow-moving currents of sludge or acid. Gravity was present but unreliable, and solid footing was rare, as surfaces often gave way under even slight pressure. Light was muted and murky, filtered through layers of suspended sediment and opaque fluids.
Conditions in the Plane of Ooze were oppressive and difficult to navigate. The air, where it existed at all, was heavy with moisture and decay, and pockets of trapped gas could erupt without warning. Movement was slow and exhausting, as travelers were constantly resisted by suction and shifting ground, or waylaid by rivers of acid. Deposits of clay, fertile soil, and buried stone were common, but extracting them was dangerous due to sudden sinkholes and collapses. Life in this realm tended to be amorphous and persistent, thriving in an environment where form was temporary and the boundary between land and water was never fixed.