The biggest addition are the expansion's three new Ruler aliens. These bosses will randomly hunt your team during campaigns (assuming you've cleared the new narrative sections already) and offer unique powers and tactics -- they'll even retreat if you don't blast them fast enough. Luckily, players will have access to four new "prototype" weapons including a single shot rifle, a throwable axe, a pistol that automatically hides dead bodies and a freeze grenade to better battle these badass bosses. Additionally, players can pick up three new armor sets -- each forged from the carcass of Ruler-class alien -- that will send their extraterrestrial minions scurrying. The DLC will also include a smattering of bug fixes and gameplay rebalances.