Original HotA Barbarian
The HotA Barbarian build is one of the most iconic Barbarian builds, and the Mantle of Mountain's Fury enhances it even further by providing additional ranks of HotA. This allows the Barbarian to deal more damage and increase AoE effectiveness.
Build Core: Focuses on dealing massive single-target damage with HotA, enhanced by the chest armor's bonus ranks.
Why Mantle of Mountain's Fury Works: The damage increase from the extra HotA ranks boosts the effectiveness of this build, and the Earthquake synergy adds an extra layer of damage output before the HotA strike.
Whirlwind Barbarian
The Whirlwind Barbarian is another popular Barbarian build, and although it's not as directly linked to Earthquake, the Mantle of Mountain's Fury can still be effective.
Build Core: Whirlwind to deal continuous damage while benefiting from Diablo 4 Items Berserk and HotA as a secondary ability.
Why Mantle of Mountain's Fury Works: The HotA rank increase helps this build when you need a burst damage ability for tougher enemies, and the Earthquake trigger can still aid in clearing large groups.
Double Swing Barbarian
For Double Swing Barbarians, this build can benefit from the extra HotA ranks in a pinch, especially when paired with Earthquake.
Build Core: Double Swing to deal rapid damage, with HotA for burst damage.
Why Mantle of Mountain's Fury Works: The Earthquake triggered by HotA can provide some extra AoE while also boosting the damage potential of the build.
Conclusion
The Mantle of Mountain's Fury is a top-tier Unique Chest Armor that Barbarian players should aim for, especially if they use Hammer of the Ancients or are looking to experiment with the Earthquake Barbarian build. The extra ranks of HotA and the ability to buy Diablo IV Items trigger Earthquakes before using HotA provide massive synergy with several endgame Barbarian builds.