Surt

Surt (Surtur in other versions) is a Jötunn who rules over Muspellheim, one of the Nine Worlds. He is Lord of the Fire Giants.

The Sword of Summer
Surt tries to kill Magnus Chase and take his sword. When Blitz and Hearth come to distract Surt so Magnus can run. Surt counters with a fire blast that knocks out Hearth. Magnus then decides to fight Surt himself.

Appearance
Magnus describes Surt in The Sword of Summer as a tall dark man in a dark suit, with his skin being "the purest most beautiful shade of black [he'd] ever seen", blacker than squid ink at midnight. His clothes are the same color, and consist of a well-tailored jacket and slacks, a crisp dress shirt and tie—all seemingly cut from the fabric of a neutron star. Surt's chiseled face is "inhumanly handsome", and resembles obsidian, while Surt's long black hair is combed back in "an immaculate oil slick", and the pupils of his eyes glow red-hot, like tiny rings of lava. As a result, Magnus decides that Surt looks like a very stylish and well-dressed Satan. He wields a fearsome curved sword made entire of white flame. When wounded, Surt's sizzling blood glows like magma.

In battle, Surt wears a trim-cut three-piece suit of chain mail, a tie and a shirt that appear to be woven from flame

Surt's voice is described as deep and resonant, with his accent vaguely German or Scandinavian.

Abilities

 * Prowess in Battle: Surt is a formidable master at combat, and is destined to command the forces of evil during Ragnarök. In The Sword of Summer, Surt held his own against three highly skilled Valkyries at once, (one of them Gunilla, who had 5 centuries of combat experience), eventually defeating and killing all of them in the process.
 * Pyrokinesis: As the ruler of the Fire Giants of Muspellheim, Surt can generate vast amounts of heat and fire at will. He is destined to unleash his full power at the very end of Ragnarök, burning the Nine Worlds with his flames.
 * Heat Generation: Surt can make the air around him "ripple with heat", to the point that he can walk straight through a car, melting a path through it "like a blowtorch through wax." He also made the paved ground bubble around him.
 * Firestorm: When Blitzen and Hearthstone enrage him, Surt causes flames to swirl around him in a spiraling firestorm, melting cars to slag heaps, liquefying the asphalt, and popping rivets from the bridge like champagne corks.
 * Fire Sword Summoning: Surt can summon his curved flaming sword at will. However, his blade dissipates when he temporarily loses concentration, like when Sumarbrander unexpectedly wounds him.
 * Fire Immunity: Surt is completely immune to any amount of fire and heat.
 * Enhanced Strength: As a Fire Giant, Surt has superhuman strength, being able to back-hand both Hearthstone and Blitzen with ease, and punch Magnus hard enough to make the latter vomit and temporarily loose consciousness.

Trivia

 * During the events of Ragnarök, Surt is destined to kill Magnus' father Frey.
 * Surt is known to have caused the Great Chicago Fire.
 * He is the inspiration for the Balrog from "The Lord of the Rings" series by J.R.R. Tolkien