Brawling: Here is where we get to Diablo 4 Gold the important stuff: select War Cry, upgrade it to Power War Cry, gaining the much-needed Berserking ability, and Leap along with the Bul-Kathos Aspect to cause an Earthquake where you land.
This becomes the primary source of causing Earthquakes in this Earthquake Barbarian Build.
Weapon Mastery: We won't be going for any skills here; rather, we will focus on activating some sub-nodes and getting some cool passives to back up the build.
Ultimate: For this, we will go for Call of the Ancients, which summons three Ancients to fight alongside you. In this case, we will be modifying it with Arreat’s Bearing to transform Korlic’s Leap to cause Earthquake.
Key Passives: We will go for Unconstrained, allowing you to always be in a Berserk state when life is below 65% and get a damage bonus of 60% and a damage reduction of up to 30%.
Skill Rotation
Gameplay Loop
Use LeapQuake. Use all shouts. Use Hammer of the Ancients and Call of the Ancients when they're off cooldown. And finally, destroy them all.
Mobbing
The Earthquake Barbarian, or LeapQuake Barb, is the ultimate mob slayer, meaning you can easily eliminate screens full of mobs with single hits using the LeapQuake moveset.
Most mobs will die within seconds after getting hit by the LeapQuake attack; if not, you can easily eliminate them by using Hammer of the Ancients with Mantle of the Mountain's Fury equipped, which causes the Earthquakes to explode, dealing extra damage to the enemies.
This setup of skills is what makes this build a high damage-dealing, versatile attacking machine.

Bossing
As easy as mobbing is with the Earthquake Barb, it gets a little troublesome when dealing with bosses. While you can do significant damage to singular targets, it is difficult to get a complete hit on them. Without a full contact hit, they will take partial damage, so position your character in a manner where you are guaranteed to deal the maximum damage to them.
The best possible method to ensure max damage is done to bosses is with the use of the Call of the Ancients Ultimate skill with Arreat’s Bearing and mercenaries (in this build it's Subo and his traps). The 30% damage multiplier and 20% damage reduction bonuses aren't the only perks of using this skill — with Arreat's Bearing equipped, Talic and Korlic also provide you with pretty strong supplemental damage. Use this skill along with Raheir's Crater skill to initiate a wide pull on Elite enemy packs.
Overpower plays a vital role in dishing out major damage in Diablo 4; this comes in handy when combating against bosses and elites.
Diablo 4 Earthquake Barbarian Leveling progression guide: Skill Point allotment
At the start of the campaign, it's a priority to get to the core skill (Hammer of the Ancients) as fast as possible by spending the minimum skill points (in this case two) on basic skills, as we won't use them once we get to the ultimate skill section.

Bash, or more specifically, Combat Bash (basic skills), can be used in the pit push to guarantee Overpower, thus taking advantage of the extra damage bonus granted by subnode skills like Warpath (deal extra damage after overpowering for 4 seconds).

In Diablo 4, you will have a total of 71 skill points: 59 skill points from Levels 2 to 60 and 12 skill points gained from Renown. Be thoughtful about where you put your points till you can fully upgrade Leap and Hammer of the Ancients.
Arsenal System of Barbarians in Diablo 4
The Arsenal System of the Barbarian Class allows you to use a specific weapon for every attack skill you are utilizing, with each of them giving out different bonuses to the skills.

We also have the Technique Slot, used to get the bonus for any weapons of your choice without actually equipping that weapon type. For this build we will be picking the two-handed mace as the main weapon because ‍Hammer of the Ancients needs it to work.

When using the build variant to run the Pit, Bash should also be set to this weapon to benefit from both its enhanced version and the ‍Combat Bash specialization.

On the other hand, in the Technique Slot, the ‍Two-Handed Axe Expertise allows us to deal 10% more damage to Vulnerable enemies. Interestingly, this build has very high Vulnerable dealing capability; so this is practically an easy task to get done.

Diablo 4 Earthquake Barbarian Leveling Gear: Best Stats and Tempering Affixes Gear (Uniques)
For this build it's important to get these few unique items for unlocking the maximum potential of the Earthquake Barb in Diablo 4.

Mantle of Mountain's Fury: Get this and explode your way through mobs of enemies. Target the farm Beast in the Ice boss to get it.
Harlequin Helm: A fantastic helm that boosts your defense and adds +4 ranks to all of your skills. Target farm Duriel, King of Maggots, and Echo of Andariel to get it.
Fists of Fate: Randomly deal up to 300% of your normal damage. this item drops from the Beast in the Ice.
Arreat’s Bearing: Empowers your ultimate skill, Call of the Ancients, specifically Korlic, allowing him to now create an Earthquake. It is dropped by Lord Zir.
These are the primary Unique items that you must have in buy Diablo 4 Gold your setup.