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In Norse mythology, Bifrost is the rainbow bridge that connects Asgard, the realm of the gods, to Midgard, the world of humans. It is guarded by the god Heimdall, who possesses keen senses and a horn, Gjallarhorn, that he will sound to warn the gods of approaching enemies during Ragnarök, the end of the world. Heimdall and the trickster god Loki are fated to kill each other during Ragnarök. The bridge is described as a vibrant, shimmering rainbow.12

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