God Of War: 7 Optional Bosses & Challenges You Must Find

4. Niflheim & The Three Tears

Alongside Muspelheim is Niflheim - the "realm" that consists of a walkway and a poison mist-caked arena.

Essentially, Niflheim is like a mini Dark Souls/Bloodborne game where the bonfire is your starting point. You'll want to venture out into the mist for varying amounts of time, bringing back "Mist Echoes" (a nod to Bloodborne's Blood Echoes) to unlock better gear to survive for longer, but this is just the beginning.

Once you've clocked the first tier of armour and resistance, you'll open up a set of stairs in the middle of the arena, where three "tears" wait to be opened.

The only way to accrue enough Mist Echoes to do so (the tears need upwards of 10,000-15,000 a piece and enemies only drop hundreds each) is to head back into the arena - though it changes in obstacle placement every time.

Going from "this is neat!" to "this is so painfully arduous", Niflheim is a challenge to your perseverance as much as anything skill-based.