Archestrylene

A liquid with the reflective sheen of a mirror and the colorful swirl of oil. It radiates powerful arcane energy, but does not appear to associate with any particular type of magic. It is sometimes abbreviated as ArcL.
Consuming Archestrylene is dangerous. The effects of imbibing it varies, but it consistently ruins the drinker's mind. As discovered during 2023-06-24 Clear the Path to Subterranea, it can turn people into zombies. The Cult/Claws of the Destroyer also drink it, which causes their eyes to become empty black marbles and bends their will to serve The Destroyer.
It has been found in the possession of leaders of the Order of the Emerald Feather and the Cult of the Destroyer. A Zenith Industries employee reported that their company made a supply deal in Subterranea to obtain lots of Archestrylene to fuel their arcanotech.
If Archestrylene comes into contact with a spirit branch, the results are explosive.