This special, magically-engineered fungus is spread throughout Exile. The fungus glows brightly, adhering to cave walls, ceilings, and floors, and it is what gives the cave floor its green-blue tint. Designed to spread rapidly, it greeted the Exiles when they first arrived in the caves.
Contrary to popular belief and her own claims, the fungus was not created by Erika Redmark. The original design is attributed to the Vahnatai. However, the Five, especially Erika Redmark, heavily researched and manipulated the fungus, increasing its luminosity and the propagation rate.
Recently, the mage X has been working on a strain of the fungus that does not destabilize the stone it grows on.