Heimdall

Heimdall is an Aesir, tasked with eternal watch over the 9 realms to ensure order. He resides in the Midrealm Temple in Asgard, where he challenges all who enter the realm.

Biography
Heimdall's parentage is unknown, as he was recovered from the banks of the river Fjörm as an infant and raised by an Asgardian noblewoman. He proved himself to be a capable warrior, especially with a greatsword, and became a captain in the Herjar.

Defense of Alfheim
In the time that the Light Elves and the Aesir were allies, Heimdall was part of a warband sent to Alfheim to stop a Fire Giant invasion following a Convergence. During battle, Heimdall was mortally wounded while saving a large number of Elves, and would have died had the Elves not healed him. For his courage, the Elves blessed his eyesight so that he may watch over the 9 Realms, and granted him eternal life that did not require the Golden Apples of Idun.

After Heimdall received his gifts from the Light Elves, he founded and led the Goldhorns, a group of Aesir tasked with venturing into other realms to quell threats. He also commissioned the dwarves Brokk and Sindri to forge Gjallarhorn, a horn with the ability to alert all of the 9 Realms when the end-times began.