To
begin with the
unlocking, Quickly fast travel to Yngvar's Fang, then walk to the obelisk and head
right to see a path that leads down
from the plateau.
Finding the
right combination of slicing, throwing, assistance
from Atreus, and parrying with Kratos» retractable shield turns each battle into a bloody ballet of timing — and that's before you
begin unlocking special attacks, like a beam of ice shooting out
from the axe or a Patronus-esque wolf Atreus can summon for battle.