Muspelheim

Muspelheim is the second of the three primordial realms: a world of fire, magma, and ruin, as old as Niflheim and its furious opposite. Where Niflheim is the cosmos winding down, Muspelheim is the cosmos burning out — a planet that is one endless eruption, ruled by the fire-jotunn Surtr and the burning host that answers to him.

Surtr has waited at the edge of the Nine Realms since before Asgard's first hall was raised. Every prophecy of Ragnarök ends the same way: Surtr crosses the Burning Branch with a sword brighter than the sun, and the realms are set alight. For that reason, this gate is the most heavily sealed in all of Yggdrasil.

The Burning Host

TODO: the fire-jotnar, Surtr's flaming sword, and the long countdown to Ragnarök.