A cursed underground keep built from deep blue stone and lit by glowing green rune panels running through every level. Tall towers and buttressed walls rise over open courtyards, with green lit ladder frames, glowing bars, and cyan crystal spires set into the brickwork. Interior halls run through vaulted archways lined with hanging fire braziers and wall torches, leading past crimson and blue banners hung beneath gold framed demon skull crests. Lower caverns open into warm orange lava chambers filled with pink crystal clusters and jagged rock walls, while dark corridors of wet reflective stone carry green light down long tunnels toward a massive glowing horned mask set into the far wall. Cross marked floor tiles, iron gates, chain rails, and stone rubble fill out the space in teal, green, crimson, and gold. Perfect for dungeon crawlers, boss arenas, horror maps, dark fantasy RPGs, or cinematic showcase worlds.