Best Mercenary Build in Path of Exile 2: Witch Hunter Grenadier
The Witch Hunter Grenadier build is one of the most powerful Mercenary builds in Path of Exile 2, particularly for players who enjoy high damage output, quick clearing of enemies, and a unique playstyle revolving around Explosive Grenades and Explosive Shot. This build shines with the Witch Hunter Ascendancy, which provides excellent utility against tough bosses and rare enemies, as well as potent damage-dealing abilities.

Core Features of the Build:
Explosive Grenades and Explosive Shot: The core of the build revolves around throwing grenades and using Explosive Shot to instantly detonate them, allowing you to Path of exile currency clear screens of enemies with ease.
Witch Hunter Ascendancy: The Witch Hunter Ascendancy gives you No Mercy (which weakens bosses and increases your damage) and Zealous Inquisition (causing enemies to explode and spread Ignite when killed).
Explosive Synergy: Using Explosive Shot to trigger Explosive Grenades makes for devastating combos, quickly clearing mobs and dealing with elites in high-tier maps.
Key Skills
Explosive Grenade
Main Skills:

Fire Infusion: Adds 25% of damage as extra fire damage.
Magnified Effect: Increases the area of effect by 40%.
Scattershot: Fires two additional projectiles (slightly reduces damage, but increases total output).
Primal Armament: Deals 25% more elemental damage.
Concentrated Effect: Increases area damage by 40%, but reduces area of effect by 20%.
Explanation:

The combination of Scattershot and Concentrated Effect increases the grenade's total damage while retaining decent area coverage. Fire Infusion and Path of exile currency for sale Primal Armament further enhance your elemental damage output, making your grenades potent.