"And he asked him, 'What is thy name?' And he replied, 'My name is Legion, for we are many'." -- recognizable as Mark 5:9 from the Christian Bible.
Legion also quotes and paraphrases this passage himself on several occasions throughout the game and, with increasing regularity towards the end of the game, and refers to himself as 'we' or 'us'. The last few words of the passage, "for we are many", are also used as a sort of mantra by 'The Five'. Legion appears as a somewhat oddly-dressed (wearing a grey morning coat, purple pin-stripe trousers and a bright yellow shirt) yet aristocratic man of between thirty and forty years of age wielding a cane-sword. However, most perturbing of all is Legion's mouth, which seems to be constantly bleeding. In addition to being the game's main antagonist, Legion is also the game's final boss. Legion is responsible for recruiting The Five serial killers by implanting them with dark souls to serve him in Deadside and then Liveside by building the Asylum and creating his immortal army to punish and cleanse the world. Legion is a being compose of many evil spirits within him which is the reason he refers to himself as we or I and also why he keeps uttering the phrase "For We are Many".
- Mutation form: Later on in the game he will grow into a monstrous beast that can shoot purple streams of dark energy much like the True Form creatures do. He shoots multiple homing purple streams of dark energy that follow Shadow Man around and one deadly concentrated beam of dark energy which is his strongest attack in this form. The creature has the head of a man and a pinkish brown body shaped like a worm & is covered in large spikes (or maybe he represents a large dark soul or soul worm.) The creature form is a very grotesque and unrecognizeable being just like Legion himself. It is advisable to use the ensigne (shield) in combination with the Shadowgun to block his attacks and deal damage to him. The combination of the Violator and Shadowgun when attacking Legion is also a good idea since it lowers his health quicker. The strategy to beating him is to keep running constantly and shooting at Legion since it's too dangerous and risky to stay in one spot without moving.