The Star Ability: 

Upheaval

Upheaval is your key AoE ability. It consumes Fury and Diablo 4 Items deals significant damage in a cone in front of you, making it perfect for clearing groups of enemies. To maximize its potential:

Focus on gear and passives that increase Fury generation.

Use Upheaval as often as possible for maximum damage output.

With Upheaval, you'll be an AoE powerhouse, taking down mobs efficiently.

Shouts: 

Rallying Cry and War Cry

Shouts are essential for increasing your damage and enhancing your Fury generation. Here's how to optimize them:

Rallying Cry: 

Boosts movement speed and Fury generation, making it ideal for boosting mobility and generating Fury quickly.

War Cry: 

Increases your damage dealt, best used when you have a good amount of Fury, especially against elite enemies or bosses.

While Challenging Shout is a great option (providing damage reduction and a taunt), it's not necessary for this build. If you want more mobility, Leap is a viable alternative.

Ultimate Ability: 

Wrath of the Berserker

When you activate Wrath of the Berserker, you gain:

Increased damage and movement speed.

The Unstoppable effect, preventing you from being affected by movement-impairing abilities.

This ultimate ability is a must for buy d4 mats taking down difficult enemies and bosses quickly.