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[???]

This Overlord's name has not been clearly identified, but they have left behind observational records.

Stargazers of the Yuque once produced 152 consecutive years worth of observational records about the dead planet Syracuse-III.
The Legion crept very slowly toward this front line, building up an advantage, exerting pressure, and chipping away at any resistance. Just like observing an ant colony, they watched their victim experience slow structural collapse.
Similar phenomena also occurred during the deaths of Red Babel, the Ogul ring, and others. Speculation rose that behind the scenes lay an Overlord with the calm, self-sufficient temperament of a chess grandmaster, pulling the strings of strife as it developed.

Potential threat to the Alliance: Very high.