carriage. They are also used as source of food and continuously resurrect after being killed unless their bones have been broken. Marvin is more pessimistic and angry than Otis, and likes to criticize him. Ratatosk – A gigantic squirrel who runs around Yggdrasil, delivering hateful messages between the eagle at the top and the titanic serpent Nidhogg below. It is also tasked to capture intruders who enter and leave Hotel Valhalla without permission. Ratatosk is able to emit sorrowful callings to people, which Magnus describes as much worse than simply being gnawed by it. Saehrimnir – A creature whom the Aesir and einherjar kill every night for food only for it to rematerialize the next morning. Its flesh's taste depends on what its eater wants it to taste like, and even has a vegan tofu option. Stanley – An eight-legged horse whom Sam speculates is a child of Odin's steed Sleipnir. He helps Magnus and his friends on several occasions. Vatnavaettir – Vatnavaettir are water horses. They are called each-uisce in Irish. Some of them attack the Big Banana in York, but Sam manages to tame them, allowing her to summon them to scurry her and the others after their successful capture of Loki in Niflheim. Mortals Mortals are human characters who live outside of the world of magic and gods, though some may be aware of their supernatural surroundings. The Jackson family Sally Jackson – Percy's mother, initially married to Gabriel Ugliano and later to Paul Blofis. In The Lightning Thief, she works in a candy shop. When she was younger, she aspired to be a writer. She is nearly killed by the Minotaur, but is discovered to be alive in the clutches of Hades. Percy travels to the Underworld to free her. In The Titan's Curse, Percy realizes she can see through the Mist, which she admits may have attracted Poseidon to her. Sally appears in all of the first five books. The Hidden Oracle reveals that she is seven months pregnant with Percy's baby half-sister. In the Magnus Chase and the Gods of Asgard book The Ship of the Dead, it is revealed that Sally has given birth and that she called her daughter Estelle, after her late mother. In the film adaptation, she is played by Catherine Keener. In the musical, she is portrayed by Zakiya Young (2014), Allison Hunt (2015), Carrie Compere (2017), and Jalynn