Muspelheim

Summary
Muspelheim is known as "The Realm of Fire", stated to be the source of all heat in the Nine Realms. It is the home of Surtr the brave and his descendants, the Fire Giants, that are prophesied to burn down and destroy the God Realm of Asgard during Ragnarök. As their only purpose is to cause Ragnarök, Mimir noted that no Fire Giant (Forgers) will appear until it begins.

History
Two years after the Battle of Sokovia, Thor has been unsuccessful in searching for the Infinity Stones, and is now imprisoned by the Fire Demon Surtur on Muspelheim. Surtur reveals that Thor's father Odin is no longer on Asgard, and that the realm will soon be destroyed by Ragnarök, once Surtur unites his crown with the Eternal Flame that burns beneath the city. Thor clashes with and defeats Surtur, taking his crown, believing he has prevented Ragnarök. This leads to a lengthy battle on Muspelheim. During the battle, Surtur's Fire Demons stormed on the Asgardian who used the Mjølnir to defeat them all. In the process, the Fire Dragon broke free and chased after Thor, who managed to escape to Asgard with the dragon's severed head, thanks to the help of Skurge.

Enemies
Mikaela is a demonic angel in the protecting the gate to leads Hawth's forgery. She is forbbided Mushroom Kingdom, and attacked Princess Peach Toadstool directly. Mario and Luigi gets message to attack Mikaela. Mikaela gets defeated and flees from Mushroom Kingdom. An hour later, Mikaela reached the Gates of Hell, A giant forger chase Mikaela to catch and deliver to Hawth. Electromaginetic field catched Mikaela, a demonic power of Exodus arrived and Mikaela starts growing a giant. Mikaela becomes a one of Hawth Bowserth's Valkyries.

Trivia

 * Muspelheim is a place in Norse Mythology.