The Alchemists' fortress is suspended high above Souk like a moon. It's made out of a skull of a giant, covered in cosmic ice and battered by space debris.
The fortress is rumoured to be guarded by fierce ice monsters and traps, and many who have tried to enter have never been seen again. Despite the rumours, the Stellar Alchemists are sought after by many powerful figures in Souk who value their knowledge and resources.