The Citadel is an archive of information for George R.R. Martin's A Song of Ice and Fire.
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"Have you seen these others in your fires?" he asked, warily.
"Only their shadows," Moqorro said. "One most of all. A tall and twisted thing with one black eye and ten long arms, sailing on a sea of blood."
It's clear that this is a kraken, referring to House Greyjoy. The single eye, however, is suggestive of Euron Greyjoy, called Crow's Eye and always keeping one eye under a patch.
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