New Game+ is a gamemode unlocked after finishing the storyline of God Of War 4 that lets you keep all armor, skills, weapons, runic attacks, pommels, talismans, resources, and special items from your original game.
In New Game+, there is a new material, 'Skap Slag' along with a new rarity, 'Perfect'. The first time you meet Brok and later, you can craft armor which isn't obtainable in normal games, the Cod Of War Set.