Graven Deep Dungeon Guide ESO

Chralzak is the final secret boss in Graven Deep. It has around 3 million HP. Defeating this boss will give you the Remote Battery buff, increasing your maximum Stamina by 10% and supercharging your stamina recovery when your stamina runs low (60 second cooldown).

How to Find Chralzak in ESO Graven Deep

After you have defeated Varzunon and jumped down to the lowest level of the dungeon, continue to follow the path and defeat the first few trash packs. You will soon encounter a slightly concealed left turn, leading to the southernmost part of the map. You will need to solve a puzzle to reach the boss. There are six levers, and each one will activate and deactivate some of the traps. Looking at a lever will highlight which traps it controls. One player should go ahead and navigate the traps while another manipulates the levers to help them. Upon reaching the far side, you can pull another lever to turn off the traps so the rest of your team can cross safely. The boss will spawn in the middle of the room after the traps are disabled. 

How to defeat Chralzak in ESO Graven Deep

Similarly to Xzyviian, this boss is really quite weak and his attacks do not do much damage. There are only a couple of mechanics worth mentioning:

Spin attack

Chralzak has a spin attack. Players should move back when this happens to avoid the AOE.

Lightning Zap

He will zap the ground with  lightning in random locations. It's best to move away from these AOEs to avoid the damage.