Create a massive dark volcanic fort...

Create a massive dark volcanic fortress matching the image: symmetrical blackstone castle, huge central pyramid-like tower, side towers, tall arches, hanging braziers, lava channels and glowing orange accents. Use blackstone, polished blackstone bricks, deepslate bricks, basalt, dark oak and limited orange blocks only. Keep walls clean and consistent, no random block mosaic. Add a large usable entrance, hollow interiors, floors, corridors, stairs, halls and rooms. Make it fully walkable and playable.