Hearthstone
Wikipedia
A Guide to Magnus Chase and the Gods of Asgard series by Rick Riordan
Hearthstone (Hearth) is a light elf from Alfheim. He is skinny with pale skin and short spiky blond hair, which, when combined with his black leather jacket, jeans, and a red scarf, "makes him look like a character from a Japanese anime". Hearth is deaf and can only communicate with ASL (Alf Sign Language), though he is able to read lips. Since his homeworld is always bright, he is sensitive to darkness.
Like Blitz, Hearth makes a deal with Mimir to drink water from Mimir's Well by one of the roots of Yggdrasil to gain knowledge about runes and in return has to work with him for several years. He becomes a companion and protector of Magnus from then on.
Hearth is the first elf in a long time to focus on magic from runes, which he has studied extensively. He can cast various runes, though doing such consumes his energy. Eventually, he progresses to the rank of a full sorcerer.
Hearth has a traumatic past, as he is effectively unwanted by his parents, who shun him for being deaf and not as great as his brother, Andiron, who died young. He is forced to face his past in the second book, when he has to collect the Skofnung Stone from his father, Alderman, who wants him to finish the blood tax imposed on him as repentance for Andiron's death. He is also reminded that sooner or later, he will have to take the othala rune from Andiron's place of death, which he planted as a reminder of his past, to complete his magic arts. In the third book, Hearth decides to take othala, using it to summon Andiron's spirit to distract his father long enough for Magnus to pierce his heart. His relationship with his friends helps him, though, and he even once calls Magnus "brother". At the end of the first book, Hearth is freed from servitude and begins learning runes at Asgard from Odin.
Like Blitz, Hearth makes a deal with Mimir to drink water from Mimir's Well by one of the roots of Yggdrasil to gain knowledge about runes and in return has to work with him for several years. He becomes a companion and protector of Magnus from then on.
Hearth is the first elf in a long time to focus on magic from runes, which he has studied extensively. He can cast various runes, though doing such consumes his energy. Eventually, he progresses to the rank of a full sorcerer.
Hearth has a traumatic past, as he is effectively unwanted by his parents, who shun him for being deaf and not as great as his brother, Andiron, who died young. He is forced to face his past in the second book, when he has to collect the Skofnung Stone from his father, Alderman, who wants him to finish the blood tax imposed on him as repentance for Andiron's death. He is also reminded that sooner or later, he will have to take the othala rune from Andiron's place of death, which he planted as a reminder of his past, to complete his magic arts. In the third book, Hearth decides to take othala, using it to summon Andiron's spirit to distract his father long enough for Magnus to pierce his heart. His relationship with his friends helps him, though, and he even once calls Magnus "brother". At the end of the first book, Hearth is freed from servitude and begins learning runes at Asgard from Odin.