Ziggurat to Basilius Rex insidlde the ruins of Uldrazim. Was the home to the Nexus Encephalon.
Atop the ziggurat were four circular pillars with massive (15 feet tall) red deep crystals nestled in crown-like tops to the pillars. Open archways lead inside the ziggurat from each layer, and stairs ran up the center of each side at a 45 degree angle. The stairs are 260 feet long (60 feet per round = arriving within 10 feet of top in 4 rounds/24 seconds), making the ziggurat 130 feet tall. Each step is 30 feet tall (0-30, 8 entrances; 30-60, 6 entrances; 60-90, 4 entrances; 90-120, 2 entrances; 120-130 solid brick to top layer.
The top of the ziggurat is 30 ft x 30 ft, with 10 x 10 pillars at each corner topped with massive red deep crystals and a 15 x 15 x 15 pool of water in the center which housed the Nexus Encephalon. The drop from the top of the ziggurat to the next layer is 40 feet. The corners of each
1st floor: Meeting room, stone furniture pushed against the walls, lit by purple torches with dark iron handle.
2nd floor: Long tunnels across the interior of the ziggurat, and chambers beneath each of the stairs containing writings of somatic compnents of various spells known by arcane-proficient Illithid.
3rd floor: Strategy room, stone furniture arranged in the center, diagonal scroll case shelves line the walls. Remaining in 2 spell scroll cases were scrolls for the Confusion and Clairvoyance spells.
4th floor: Reinforced pillar and arch layer. Bricks taken from the divot above for the Nexus Encephalon pool were arranged in a reinforcing pillar in the center of this layer to the ceiling. The bricks were built around a dark marble plinth with a 5,000 gold-value grey diamond atop.