This chapter is titled Fimbulwinter.
This surprised me because it’s a much lesser known part of Ragnarok.
The Fimbulwinter is basically the prelude to Ragnarok, where three seasons of the year are filled with snow and ice.
If my memory serves me correctly that is.
It’s actually interesting because I don’t remember Fate Grand Order bringing this up despite Skadi and the Lostbelt related to her.
I only learnt this one from a book I read many many years ago.
I can only vaguely remember it from a book I read many years ago… I think it was called Odd and the Frost Giants?