While the Valkyries can be taken on at any time of the game, it's best to wait until you've completed most of the storyline and have unlocked better armour (at least level 6). You'll need to find and open up the Hidden Chambers to first initiate the fight, so follow along for all the necessary information.
Here's a guide outlining All God of War Valkyrie locations for you to find and defeat some of the most difficult challenges in God of War.
God of War - Hidden Chambers and Valkyries
With the PC port for God of War finally available, there's no doubt many will be looking to play through the iconic storyline. Part of the challenge will be to defeat Valkyrie bosses found in Hidden Chambers.
Players will encounter the first Hidden Chamber early in the game (in the Wildwoods section) but will not be able to open it at once. Continue playing through the storyline until you have access to open the Hidden Chambers.
Once you have access, backtrack to the first Valkyrie in the Wildwoods section Hidden Chamber. Upon defeating the first Valkyrie you will unlock a side-quest titled "Prove Your Valour" which tasks you with hunting down the remaining Valkyries.
Six of the Valkyries can be found in Hidden Chambers, four in Midgard, one in Muspelheim, and the last in Niflheim. There are two other Valkyries that can be found in other locations.
Here's where you'll need to look to find the Valkyries in God of War.
Valkyrie Kara location
To find this Valkyrie, search for the Hidden Chamber in between The River Pass and Foothills, Midgard.
Valkyrie Gunnr location
This Valkyrie can be found in the Hidden Chamber located in Thamur's Corpse, Midgard.
Valkyrie Eir location
The Eir Valkyrie is located inside a Hidden Chamber near The Mountain, Midgard.
Valkyrie Geirdriful location
The Hidden Chamber for Geirdriful can be located at the Foothills, Midgard.
Valkyrie Olrun location
The Hidden Chamber for Olrun can be found in Alfheim.
Valkyrie Rota location
The Hidden Chamber for Rota can be found within Helheim.
Valkyrie Gondul location
This is the last step after completing the trials in the optional realm of Muspelheim. Gondul can be found atop the mountain in Muspelheim.
Note: Accessing Muspelheim requires players to find all Muspelheim Ciphers within Midgard first.
Valkyrie Hildr location
Hildr is pretty much the last Valkyrie you will battle, as it requires you to access Niflheim, a late-game dungeon. Similar to the Gondul Valkyrie completion, accessing Niflheim requires finding all Niflheim Ciphers within Midgard first.
Featured image courtesy of Jetpack Interactive.