We have intel on a new kind of alien threat, Commander – and your soldiers aren’t going to like it. This is the Gatekeeper, a powerful psionic floating entity with surprisingly strong offensive and defensive capabilities in XCOM 2.
In its closed state, the Gatekeeper’s offensive capabilities are limited; however, it’s extremely resistant to damage. Once it opens up, though, that’s when it becomes an incredible threat to your squad.
Here’s the worst part about the Gatekeeper: while the Sectoid is able to resurrect one fallen unit (ADVENT, XCOM soldiers or civilians) at a time, the Gatekeeper is able to revive multiple units at once.
The Gatekeeper is able to open psionic rifts to damage nearby soldiers or can fire directly at any unit with its Fire Beam attack. Finally, its Consume ability allows it to touch any nearby unit to sap its life and heal itself. If the target is slain by this attack, it may be reanimated as a psi zombie.