Balor and Cethlenn imprisoned their daughter Ethniu in a crystal tower on Tory Island, hoping to prevent the prophecy that Balor's grandson would slay him.
Cian infiltrated Balor's crystal tower with the druidess Biróg's help and fathered Lugh with Ethniu. Lugh inherited both Tuatha Dé Danann and Fomorian blood, fulfilling the prophecy of Balor's death.
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