A Medic who is one of Reunion's squad leaders, often working in tandem with Faust. He heals the wounded while commanding his troops to attack, and can improve their life recovery rate. He boasts a high resistance to Arts. Currently, it has been confirmed that he is the one controlling the Hosts.
A Reunion squad leader who can heal up to 3 Reunion units at the same time, and doubles the health regeneration of Possessed units.
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—Tooltip
Unlike other bosses, Mephisto has no offensive capabilities whatsoever, with his attacks instead healing up to three enemies anywhere on the map at once, similar to those of a Multi-target Medic, and as long as Mephisto is present, all Possessed enemies capable of regenerating their HP (Possessed Soldiers, Possessed Junkmen, and Possessed Heavy Defenders) will have their HP regeneration rate doubled.
Outside his healing capabilities, however, Mephisto has no other remarkable stats other than his above-average RES that makes him resistant to Arts damage.
