A dueller who held a bayonet like Ashley, and later the Dark Spear of Seigfried; the infamous backstabber of Wild ARMs 3; the one who temporarily got rid of Asgard, double-crossed the prophets, and planned to rule the world, only being finally stopped when Seigfried reappeared to reclaim his spear; all of this Janus has in his name.
In the DL, the drifter turned demon has in his hand the magical power of the Proton Beam, the same attack that had brought your heroes to their knees. And should he face someone with magical defense to bear, the Dark Spear is there to strike fear to their hearts.
While he hasn't had much luck in the arena, don't expect the opportunistic drifter to take his losses lying down. After all, it had taken many, many deaths to finally extinguish his mad desire for power and fame.