I'm pretty sure it's just a reference to Moonlit Bear.

I'm also pretty sure Eve's hallucination is a result of her brainwashing abilities going haywire on her like it's done several times over the course of the series. She wasn't even being given any Venom at the time. Venom seems to me imo given its shared name with the Venom Sword to be about the victim's will, not what they're visually perceiving.

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