The new stuff is one-of-a-kind prototypes: the Bolt Caster a single-shot high damage weapon, the Hunters Axe that is used by a Ranger and can be thrown at enemies or as a close combat weapon, the ShadowKeeper pistol which has the Shadowfall ability that is guaranteed to hit and then places the unit in concealment if the enemy is killed, and the Frost Bomb grenade that will freeze targets for a short time.
Of course, having new deadly aliens means having to have new gear as well. If you don’t take out a Ruler fast enough, they will exit the combat area and will return at some other time. These rulers have unique behaviour and tactics, so don’t expect them to be as simple as the rank and file that you have fought so far. They will show up randomly once you have completed the introductory mission that will be added as well. One of the new Rulers is the Viper King but all are formidable. Alien Hunters introduces a new room to the Avenger the “Hunters Lodge” under the armoury tab as well as new missions, new weapons and armours, including 3 “Ruler” aliens into combat missions.
The second DLC for XCOM 2 has been announced. Commander, reports are coming in about sightings of new aliens that seem to be commanders within ADVENT forces, these rulers seem to be more capable than regular forces.