Phyrocinin is a nano-infused chemical compound - a synthetic hormone - developed by Dr. Talmage in collaboration with the Arkaeni scholar Niril that is interferes with the neural receptors. What makes it unique and extremely valuable is that it eliminates homeostatic negative feedback so the body doesn't correct the effects of the compound. It was used extensively on test subjects at Wornspire and is also built from a primary ingredient in the drug Adoxipham.
True Nature
In truth, the hormone was an attempt by Niril to replicate the effects of an ancient phenomenon regarding magic, he essentially tried to manufacture a modern version of what was once called a soulpiercer, who had the ability to control magic that existed within another individual.