Vis

Vis is a perversion of Od . The Demonic equivalent to Od. Its source is unknown though it has existed opposite Od since the beginning. Legends say that Vis is created and multiplied by the extreme ill will, trauma, hate, death and wanton violence in humanity. Vis also permeates through-out all of the physical realm and is chaotic in nature and extremely dangerous to Humans often manifesting in necrotic damage to the tissue of any Magi who attempts to utilize it or is the victim of one who uses it.
Vis is used naturally by demons for their Manus and is the cause of the Lycanthropy and vampirism sickness in humans.
When Vis mixes with Od in a human and is converted into their manus it is called Chaos Manus