Similarities are sometimes peripheral, such as that both Bran the Blessed and the Grail keeper the Fisher King receive wounds in their legs and both dwell in a castle of delights where no time seems to pass.
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The narrators, all characters in relative ignorance, find themselves caught in a struggle between various powers of Arthurian legend, such as Mordred, Morgan le Fay, the Fisher King, and Merlin himself, which stretches across different centuries and different realities, and seems to have as its focus the bones of Merlin and a laboratory investigating quantum mechanics.