That stylized "M" is the lower half of Lahabrea's Ascian glyph. I can't say for sure whether or not it's connected to Zodiark, but given the Pandaemonium story will chronologically take place after 6.0, which is supposed to wrap up the Zodiark / Hydaelyn arc... I doubt it.
Further, with the revelations about Eden's true nature in the Eden's Promise tier, it's heavily implied the Idol is Mitron exerting his will in an attempt to return Gaia to her Loghrif identity.



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