Odin believed the answer to the riddle ""When light dies, then will Ragnarok begin"" would bring about the end of all things. Loki went to Odin in disguise and gave him a metal mask. When the king of Norse gods looked into the mask, he was blinded -- which fulfilled the third tragedy. Loki then blew Gilma's Horn, which brought on Ragnarok, and he killed Thor witha poisoned dart. When Hercules poured paint into the Book of Fate, he returned to the moment before he accidently killed Balder. He exposed Loki's plan to Balder and thor, saving their lives.
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