Netherworld Energy in The First Berserker: Khazan is used to heal Khazan whenever players are low on health. There is a fixed amount of these that are available at the start of each mission and can be replenished when interacting with the Blade Nexus. The game starts the player off with three heals that they must use throughout the opening missions of the game. Players can find multiple upgrades for the Netherworld Energy, either hidden away behind a wall or in plain sight. For players missing any upgrades, they can check out the location of each upgrade below.