Kratos Was INSIDE The World Serpent When Thor Smashed It Back In Time
Kratos Basically may utilize the moment Thor smashes the World Serpent back in time, to time travel. So, that might also insinuate that Kratos warns Tyr of the future. Which is why Faye prepared for Atreus' first journey to the mountain and protected Kratos' presence by cloaking his existence. Kratos will replace Surtr in the new timeline. Therefore, old Kratos probably waits in Muspelheim... Either way, I'd say the serpent know kratos because they've been together since time began.
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