The Traveler is evil, and he will usher forth an entire armada of Guardians who either forcefully or willingly fell to The Darkness. These Guardians will be known as Aggressors, and each class will have their specific roles outlined to greater degrees. Titans will act as front line Darkness soldiers, tanks in both offense and defense, with greater powers of darkness harnessing their already potent abilities. They would be the most powerful of the three classes, physically and weaponry speaking. Hunters will act from the shadows, incorporating their stealth-like abilities for assassination missions, espionage, sabotage and assisting Titan Aggressors from behind. They would be the sneakiest and most cunning of the three classes. And last but not least, we have Warlock Aggressors, easily the overall most powerful of the three classes, and only seen in the most dangerous of strikes or bounties. These beings would have absolute mastery of the Darkness, with abilities that could drown out the light of the sun, and create eternal night. Mirage clones, supers that would annihalte a 6 man strike team, and pure magical beasting to anyone not prepared to take one on. Killing a Warlock Agressor would be a tall feat indeed. These are the Aces of the Traveler's undead dark army. That's my theory at least. I could imagine the missions would be epic.