|“||What am I?! Your first call?!||”|
–One of Ratatoskr's quotes when summoned
Ratatoskr is one of the runic animals that can be summoned by Atreus to give Kratos stones. Unlike other summons, this squirrel can talk and is none too pleased at being used as an errand boy.
Ratatoskr (generally considered to mean "drill-tooth" or "bore-tooth") is a squirrel who runs up and down Yggdrasil, the world tree, to carry messages between the eagle perched atop, Hræsvelgr, and the serpent Níðhöggr, who dwells beneath one of the three roots of the tree. Ratatoskr is attested in the Poetic Edda, compiled in the 13th century from earlier traditional sources, and the Prose Edda.
Befitting his alias as the Bitter Squirrel, Ratatoskr is a sarcastic, foul-mouthed and rude animal who will always take the opportunity to insult the party members whenever he is summoned. However despite this, he never tries to screw Kratos and Atreus over and seem to always give the stones that Atreus has asked for even when he is repeatedly summoned.
- The stones that he gives to Kratos is entirely dependent on the arrow Atreus is using right now;Light arrows will give him a health stone while a Shock arrow will give him a Rage stone.
- Ratatoskr claims to have rabies, despite being a spectral animal, and occasionally mentions this to Kratos and Atreus when summoned. However, since Ratatoskr has been known to sometimes spread falsehoods when carrying messages in the World Tree, he most likely lies about having to it to spite Kratos and Atreus.
- On a few specific markings, you can summon Ratatoskr and he will unearth a large amount of Hacksilver.
- Ratatoskr's insults will change depending on your current state. If you summoned him while you're healthy, he will insult you for summoning him while barely having a scratch. If summoned when Kratos's health is low, he will mock his skills and will sarcastically claims himself as their savior.
- If he is summoned for the first time in the middle of a battle, Mimir would try to make a comment about the squirrel but Kratos told him to be silent.