Delerium

Delerium crystals are highly sought after by many factions, including powerful mages, rogue craftsmen, and even some religious groups like the Shattered Star. The crystal's corruptive nature makes them a double-edged sword, capable of both great good and great harm. Some believe that Delerium can grant the user immense power, including immortality, but at a steep cost. However, obtaining Delerium is not easy, as the Haze where it grows is dangerous and often filled with mutated creatures. Those who seek Delerium must be skilled in both combat and magic to survive the dangers of the Haze. Some even resort to hiring mercenaries and adventurers to help them collect the crystals.
The process of refining Delerium is also dangerous and requires special skills and knowledge. It is said that only a handful of craftsmen in the world possess the skill to work with Delerium, and their services are highly coveted. However, the results of their work can be awe-inspiring, as Delerium can be used to create powerful magical weapons, armor, and other items.
Despite the dangers and corruption associated with Delerium, its allure is strong, and many will stop at nothing to obtain it. This has led to conflicts and rivalries between factions, as well as the rise of black markets for Delerium and its products.
Delerium is seen as part of Miros  by the cult of the Shattered Star. But their true nature is unknown.

Spoiler Truth about Delerium

See Shattering