The mineral present in trellanstone that has the power to control amorphia, and responds to the will of a sentient being.
Necrophia is a crystaline mineral that runs in veins through trellanstone. It is unclear if trellanstone has other elements that are important for the control of amorphia besides the necrophia.
Necrophia is critical to the function of the Orb and is therefore the vital material that allows all sorcery, except Elder Sorcery.