Heimdall lives in Himinbjörg at the Rainbow Bridge. He rides his horse Gulltopp. He wears the Gjallarhorn, the "resounding horn," which can be ushers at the end of the Ragnarok and heard around the world. Heimdall is the guardian of the Bifrost rainbow bridge that connects Midgard to Asgard. There he guarded the bridge in front of the mountain giants. He sees and hears everything and is as "as only the Vanir" called. The rams are sacred to him. In the decisive battle of Ragnarok Heimdall fight against Loki. Both are killing each other.
By the calls of three cocks Ragnarök is initiated. Fialarr, the beautiful red, awaken the giant. Gullinkambi, gold comb, awakens the gods heroes. The black and red rooster wakes the underworld of Hel.