Surtr

Surtr is the king of the Kingdom of Flame Múspell and relentless in his conquest. He is planning to destroy other kingdoms, particularly setting his sights on Askr, having already destroyed 2 in 9 months, the first being an unnamed Kingdom in 3 months, and Nifl, the Kingdom of Ice, in 6. Surtr has also allied himself with Veronica and the Embla Empire, as stated by her in Chapter 1, Part 4 of Book II. He first appears the end of Book II, Chapter 1, where he burns up many fields and forests and defeats Fjorm. Alfonse and Anna both state that this is the prophecy in which the entire world comes to an end in flames, prompting them to take on the Flame King himself, however, he is currently unable to even be harmed as he carries a power similar to Embla's Ward, called Múspellflame, forcing the Order of Heroes to retreat.