Mazariyan was a Separatist fortress on Xagobah designed by the Techno Union. It was a living organism or collection of organisms that had the ability to heal. The creation of the Mazariyan Citadel involved bioengineering Xagobah's native lifeforms such as fungus which normally fed only on bacteria but after the genetic engineering of the malvil-tree; it led to the creation of a living structure that killed prey around it without feeding on them. The fortress was breached by the Galactic Republic during the Clone Wars, which resulted in the deaths of many Xamsters.