Bifrost was made of three colors with magic and great skill by the Aesir and is incredibly strong. It is also called Asbru, referring to its makers. At the end of the cosmos, this rainbow-bridge will collapse.

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Heimdall

Heimdall is the handsome gold-toothed guardian of Bifrost, the rainbow bridge leading to Asgard, the home of the Gods. The rainbow bridge seems to be a common symbol in many religious traditions other than Norse Heathenism. In the Vedic tradition, it represents the Antakaranha of humanity (connection between the body and the soul). Other traditions see it as a message from the Gods, or a Bridge between the Gods and Mankind. This would tend to indicate that the Norse/Germanic people were aware of the presence of an overshadowing Soul for each individual, as well as a group or tribal intelligence. It is Heimdall who is to sound the signal horn to the Aesir that Ragnarok, the great destruction (or transformation?) is beginning.

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