In Norse tradition, Heimdallr serves as the guardian of the Bifrost bridge, which connects the realm of the gods and humans. He is known for his incredible vigilance, possessing keen senses that allow him to hear grass growing and see great distances. Heimdallr is prophesied to sound the Gjallarhorn during Ragnarök, signaling the onset of the final battle between gods and giants. His role emphasizes the importance of watchfulness and protection in Norse cosmology, representing the need for a diligent guardian in a world filled with threats.