It's really good, Gillen has stuck the landing on all of his other excellent comics so far so I am not worried.
I guess I should say, if you haven't read any of his work, Gillen is obsessed with stories and narrative and what telling them does to us as humans. And Once and Future is one part the story of the Matter of Britain as a horror story, rex quondam rexque futurus as a literal threat, because Arthur comes back as a semi-revenant monster and it's up to a monster-hunting granny, her grandson who plays Percival (and other people, later on, because it draws in more stories too, like Beowulf), and others to try to stop him, and Merlin, and everyone else who is stuck in the story and can't stop it.
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I guess I should say, if you haven't read any of his work, Gillen is obsessed with stories and narrative and what telling them does to us as humans. And Once and Future is one part the story of the Matter of Britain as a horror story, rex quondam rexque futurus as a literal threat, because Arthur comes back as a semi-revenant monster and it's up to a monster-hunting granny, her grandson who plays Percival (and other people, later on, because it draws in more stories too, like Beowulf), and others to try to stop him, and Merlin, and everyone else who is stuck in the story and can't stop it.