So, these enemies are supposed to be resurrected by whatever is beneath the Moon, with Fanatic appearing as one. I have taken into account its most likely a hallucination because it is only a shadow form and not fully formed like Nightmare Phogoth, so it could just be screwing with us.
That aside, the Fanatic should still be alive, as he can resurrect himself as many times as he wants, and one of the Stolen Intelligence files say that he is still roaming the galaxy. I’m a little confused though, does this mean he’s dead or did they just retcon his resurrection ability?
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They aren't resurrection's, in that same vidoc Bungie said that these nightmares take the form of traumatic moments/entities in a Guardians life Fikrul is still alive but him helping kill Cayde, sending monstrosities after us, and then forcing us to feel guilty for all the lives we've taken counts as a trauma.