Minecraft 120x120 floating island '...

Minecraft 120x120 floating island 'Mercury'. Dark volcanic prison world, handcrafted terrain with steep cliffs, deep caves, ravines & height differences. Center: tall elevated prison fortress, cell blocks, guard towers, storage, corridors, chains, large courtyard. Player spawn inside fortress, exiting via massive gate to island center. Impassable lava canals surround key areas. Add steam vents, lava fissures, hanging chains, ruined structures, burnt camps, small mine with visible copper/iron ore. Minimal vegetation: charred trees, dead bushes, sparse roots. Palette: Deepslate, Deepslate Bricks, Blackstone, Polished Blackstone, Basalt, Tuff, Magma Blocks, Netherrack accents, Gilded Blackstone, Iron Bars, Chains, Lanterns, Lava. Dark fantasy, cinematic lighting, non-repetitive.