They technically already did time travel in norse.
they went to future of Jotunheim.
How come all the gaints are dead before Ragnarok?
Did you play the first game? you're getting so many things wrong lmao
Odin tricked the Giants into letting him and Thor get into Jotunheim, and Thor killed most of them
The only ones that survived were Atreus' mother and Angrboda it seems
Ragnarok was also meant to start later
But Kratos and Atreus fucked everything up, because Kratos wasn't meant to be here it seems
Baldur died early
and now shit is picking up the pace