The Sword of Summer (Magnus Chase and the Gods of Asgard, #1)

by Rick Riordan

“A fart elf?” “Gah! Clean your ears, kid. A svartalf. It means dark elf. I’m from Svartalfheim.” “Um, I thought you just said you’re a dwarf.” “Dark elves aren’t actually elves, kid. It’s…what do you call it? A misnomer. We’re a subset of dwarves.”