Gatekeeper (XCOM)

Gatekeepers appear to be large masses of flesh adorned with tentacles, a form concealed underneath a shell of spherical armour which creates the illusion of them being robots. Gatekeepers are notorious for their major psionic powers which are believed to be on par with the Ethereals themselves. Their psionic abilities include the ability to drain the life force from others through physical contact and opening psionic gateways, both of which may reanimate the bodies of those killed in these ways.