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Ratatosk (often spelled Ratatoskr) is a monster squirrel who runs up and down the world tree Yggdrasil. He spreads lies and gossip between the dragon at the roots of Yggdrasil and the eagle at the top. He does this attempting to bring down Yggdrasil. He was briefly seen in The Sword of Summer. He casts insults that can fill you with despair when you hear them. The only one who is not affected by this 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 and was defeated 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.
Sharp Claws and Squirrel Fangs :- Ratatosk's claws were described as scimitars and would likely have large fangs also, that allow more physical attacks.
Climbing: He can easily scale the World Skill, having down 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 to people that have the power to depress an individual harshly as he did to Magnus. As in all forms of Audiokinesis it is easily evaded by the deaf.