As a member of Reunion (and later one of its field commanders), Mephisto's Originium Arts manifest in the form of a white powder that only affects the Infected, manipulating and catalyzing Originium growth within the Infected (typically wounded targets) to reanimate them as mindless Possessed controlled by Mephisto; these zombie-like beings are blessed with superhuman durability and regenerative abilities that can be further improved by Mephisto's healing Arts. His powers are also able to further accelerate the infection of the Possessed, greatly amplifying their strength and aggressiveness at the cost of burning away their life force and consequently driving them into a berserk fury where they are unable to distinguish from friend and foe, attacking everything (except Mephisto and his close allies) and forcibly converting victims into more Possessed for the herd.