Phyzite

""The strange crystalline form is named Phyzite. The corruption begins by the smallest fragments of the crystals becoming embedded in one's flesh as they make their way in and expand... rapidly.""

Spreading throughout the Great Dark and Twisting Nether alike, Phyzite is a mineral in the form of crystals that corrupts and transforms nearly everything it touches. Most details regarding the substance and its affliction remain unknown.

It is believed that mo'arg, or at least felguards, may be immune. However, this has not been proven.

History
Phyzite was first encountered by the Hellflame Marauders when an expeditionary team to an unnamed planet returned to port in dire straits: bodies of most crew members littered the ship alongside the corpses of strange creatures composed entirely of crystals. At least one crewman had the foresight to activate an emergency measure to scour all life aboard the vessel, which was decommissioned, but several of the demons aboard remained missing. High Cleanser Zala'duun, a powerful darkglare in service to the Marauders, reached out to Argus for assistance. Answering the call, High General Zorrix posted an invitation to his trusted allies, securing the aid of the doommaiden Neraada and the annihilan Zar'galor. Together, the two traveled with Zala'duun into the orbit of the aberrant planet, tasked with either freeing or slaying the rest of the expedition.

Teleporting to an abandoned portal on the planet's surface, the pair braved their way through various crystalline entities before finally coming upon the changed admiral, Daakath. His mind subjugated by Phyzite, the admiral was stopped from opening a major portal to other Legion planets.

The admiral's death triggered a reaction from a gargantuan beast roaming the skies of its lair: Phyzarus the World-Eater. Its colossal form destroying the failed portal site, the draconic creature set upon Neraada and Zar'galor. The lengthy battle that ensued afflicted both demons with the Phyzite contagion as tiny crystals dug into their flesh, threatening to overtake their bodies minds as they unleashed their fury upon Phyzarus. Ultimately, they were successful: Phyzarus met its end, and they returned to Zala'duun's vessel in orbit just in time to be carefully cleansed of the crystalline affliction.

Two ships orbit the unnamed planet, ever-watchful for any odd sightings, as the Hellflame Marauders consider their next move against the crystalline corruption.