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LEGENDARYCF-AA6305AD
1 on the trailheat

The River of Ink

▁ signal intercept

Eight seals. One story, five centuries long — of a round city, the house that held the world's knowledge, and the day the river turned black. Few will finish this. Begin anyway.

Clue 1 of ?

Evidence · sealed

In the year 762 a caliph called the Victorious drew a perfect circle on the banks of the Tigris and built a city inside it. Name the city.