Legend Has It
Between the mystical and cyclical natures of the Asgardians, accounts vary on exactly how they come to be. Some stories state that they and the rest of the Ten Realms are born from the release of energies following the Demogorge attack on the Elder Gods. Another states that everything springs from Ginnungagap, the primordial nothingness. From there, the magical cow Audumbla licks the ice of the Well of Life, eventually uncovering Buri, the first of the Asgardian gods. He and his Frost Giant wife begat Bor, Mimir and Njord. Bor takes over as the leader and has Cul, Odin, Vili and Vi with his giantess wife Bestia. He also establishes Asgard followed by his people, the Aesir. After ages of bitter feelings, Vanaheim was annexed by Asgard, so Njord begins fathering the Vanir gods of Vanaheim. The groups collectively become known as Asgardians and are virtually indistinguishable.
The Way of the Warriors
Functionally immortal, the Asgardians (AKA Norse, Germanic or Teutonic gods) age at an extraordinarily slow rate upon reaching adulthood and are nearly impossible to kill, but are known to perish on occasion. Those who perish during war are taken to Valhalla by the Valkyries while the others go to the land of the dead known as Hel, overseen by the death goddess Hela. The dishonored dead, in particular, are sent to Niffleheim. These mystical beings benefit from the consumption of Golden Apples, harvested by the goddess Idunn, which keep them powerful and long-living.
Average Asgardians have denser bones and skin than a human's, which makes them resistant to diseases and injury. They also possess superhuman healing, endurance and reflexes. Only dispersal of a major portion of an Asgardian’s bodily molecules will cause death, and even then resurrection via other gods may be possible. Asgardian flesh and bone are three times denser than human tissue, and average gods and goddesses can lift about 30 and 25 tons, respectively. Some have additional powers based on their deity designation, such as the god of speed Hermod who moves at great speed and Thor Odinson, AKA Thor, being the God of lightning and storms.
Asgard is a warrior culture, so most citizens are trained in combat and are more than willing to pick up a weapon—often a signature one—to defend the realm. Their battles occasionally play a role in the apocalyptic battle Ragnarok, also known as the Twilight of the Gods, a cycle that sees the Asgardians perish only to be reborn again with varying degrees of knowledge of their previous lives. This recurring theme in Asgardian life is overseen by the mysterious gods known as Those Who Sit Above In Shadow, who draw power from this cycle. The Asgardians’ continued existence is tied to the health of the world tree Yggdrasil, which connects the ten worlds of the realm of Asgard. Their destinies are written in the spinning fabric of the Norns.
The Ten Realms and Beyond
Asgard is one of ten realms connected to the world tree Yggdrasil and has a variety of dealings with them all. They are often allies with the Light Elves of Alfheim, the dwarves of Nidavellir, and the old gods of Vanaheim. However, conflict seems near-constant with the fire demons of Muspelheim, the Frost Giants of Jotunheim, and the Dark Elves of Svartalfheim. Asgard does business with the Angels of Heven until their betrayal leads Odin to banish the entire realm. Hel remains the land of the dead and its sister realm, frigid Niffleheim. Another realm is Midgard, where the people of Earth worship the Asgardians as gods, and are thrilled by their adventures in more modern times. They also have dealings beyond the Ten Realms with the Celestials, the Shi'ar and other Pantheons, including the Olympians.