The realm of Niflheim is an optional realm in God of War that can only be accessed after you gain the 4 Niflheim Language Ciphers. Once they are collected, you
Isle of Death - God of War (2018) Guide - IGN
God of War (2018) Guide - IGN
Iron Cove - God of War (2018) Guide - IGN
Shores of Nine - God of War (2018) Guide - IGN
Forgotten Caverns - God of War (2018) Guide - IGN
The River Pass - God of War (2018) Guide - IGN
Lookout Tower - God of War (2018) Guide - IGN
Wildwoods - God of War (2018) Guide - IGN
God of War Niflheim item guide, walkthrough and maps - Polygon