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|“||You have failed. No one likes you. You are dead. Your dwarf's pith helmet is stupid. You could not save your mother.||”|
Ratatosk (often spelled Ratatoskr) is a monster squirrel who runs up and down the world tree Yggdrasil, attempting to bring it down. He spreads lies and gossip between the dragon at the roots of Yggdrasil and the eagle at the top. Ratatosk was briefly seen in The Sword of Summer. He casts insults that can fill one with despair when one hears them. The only character seen so far, who is not affected by his insults, is Hearthstone, because he is deaf.
Ratatosk attacked Magnus, Blitzen, and Hearthstone in Hotel Valhalla when the latter duo climbed Yggdrasil to get to Valhalla. He was very strong. Yet, he was pushed back by the members of Floor Nineteen of Valhalla.
Ratatosk was then seen when Magnus, accompanied by Samirah al-Abbas, Blitzen and Hearthstone, had coaxed Yggdrasil's branches and entered it. Ratatosk was seen more vividly this time, and his claws "were scimitars." Ratatosk's bark (insults) were said to be, by Sam al-Abbas, "His bark is literally, worse than his bite." Since Hearthstone was unwell, Sam had to camouflage herself and Hearth with her hijab, while Magnus and Blitzen escaped to Folkvanger.
Ratatosk briefly appears with his mouth on the window of Helgi's office. Fortunately the window was sound proof and no one could hear his insults. Helgi closed to window with shades and continued to talk about Loki's escape.
Sharp Claws and Squirrel Fangs :- Ratatosk's claws were described as scimitars and would likely have large fangs as well. These allow him to carry out strong physical attacks.
Climbing: He can easily scale the World Tree, having been doing so for centuries.
Audiokinesis (limited to Ratatosk insults):- Ratatosk is known mostly for its ability to cripple and weaken opponents with taunts. His bark sends telepathic sound wave messages that have the power to depress an individual harshly, as he did to Magnus. These insults can range from very funny, like "Your dwarf's pith helmet is stupid", to very hurtful, like "You could not save your mother". As in all forms of audiokinesis it is easily evaded by the deaf.