The regular sharp right angles demonstrate the craftsmanship of this ziggurat. The blocks meet with only a hairs breadth between. The walls are still made of that strange smooth rock... The strangest, impossibly smooth rock which Candrol insists is granite, although that seems quite impossible.
The ziggurat is filled with undead. Skeletons, wights, zombies, and all manner of nasty undead stalk the halls. The tomb is cursed, filled with dark and hateful energy. The air is thick with vile magics.
A new addition to the ziggurat had begun, underground, to mirror the upper half. No one knows if it was ever finished, or if they do they aren't telling.