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You want 1 of the 5 passives on the Hellfire Amulet and the other 4 can be in your skill tree.

1. Berserker Rage

2. Boon of Bul-Kathos

3. Ruthless

4. Rampage (Bloodthirst, Superstition, or Tough as Nails for survivalbity)

5. Nerves of Steel

Any of the 3 rings can be put into Kanias Cube but I recommend the Obsidian Ring

Sockets:

Helm - Diamond (more Cool Down Reduction for Wrath of the Berserker)

Chest/Pants - Rubies (more damage) unless you are having a hard time staying alive then go diamonds.

Weapons - Emeralds for Crit Damage

It really doesn't matter what Legendary Potion you have but I have the Kulle-aid one to get rid of walls.

You want as much area damage as possible and about 35-40% Cool Down Reduction for Wrath of the Berserker.

If you are again struggling with survivability you can switch to 'The Slanderer' and 'Little Rouge'

If you want more move speed switch out 'Bane of the Stricken' for 'Wreath of Lightning' (note: don't upgrade wreath of lightning past lvl 25 since the only reason you are using it is for the move speed.)

For the weapons you want to Ramaladni's Gift for the socket if you can't then it's fine but Ramaladni's Gift is highly recommended

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