Path of Exile 2 Patch 0.5.0 Mercenary Cluster Grenade Leveling Build: The brand new Advanced Thaumaturgy enriches your playstyle!
Category: Path Of Exile 2 Posted: Jun 06, 2026 Views: 11
Thanks to buffs for Gemling Legionnaire Ascendancy, specifically changes to Advanced Thaumaturgy Notable Passive Skill, Mercenary class has become increasingly popular in Path of Exile 2 Patch 0.5.0.
In this guide, we'll explain the new effects of Advanced Thaumaturgy and introduce a build designed to maximize the potential of Mercenary and Gemling Legionnaire. Read on to learn more!

The value of the reworked Advanced Thaumaturgy
As a signature skill for Gemling Legionnaire, Advanced Thaumaturgy now grants a bonus effect based on the quality of your socketed gems.
For Mercenary's Cluster Grenade, this change transforms it into a skill that detonates instantly, delivering a shotgun-like blast capable of one-shotting bosses.
Here's why: Previously, Cluster Grenade's effect involved an initial explosion followed by multiple stages of spread. The four initial projectiles would split into 18 micro-projectiles each, potentially resulting in 72 total hits.
Now, with the reduced detonation time and the gem quality bonus, all 72 hits detonate at the exact same point. When focused on a single boss, this burst damage makes one-shotting them entirely possible!
However, to fully realize this build, you'll need to complete the initial leveling phase and craft the rest of your gear. Don't worry, we've outlined a plan for you below!
Leveling as a Mercenary
First, it's important to note that while this new Cluster Grenade Mercenary build is incredibly powerful, it doesn't require high-end gear; the skill itself carries most of the weight.
That said, if you have the budget and want to perfect your character, you can buy PoE 2 currency at IGGM to further boost the build's power.
Act 1
After landing and picking up your starter gear, defeat The Bloated Miller and acquire Permafrost Bolts, Fragmentation Rounds, and Entangle skills.
Entangle allows you to cast while moving quickly, eliminating the need to reload your crossbow or grenades and removing the need to wait around. Permafrost Bolts can freeze bosses, allowing you to shatter them with Fragmentation Rounds.
You will later unlock Multishot and Magnified Area support gems, but it is best to save them for your next skill, Explosive Grenade. After defeating The Rust King with this setup, you can also add Flash Grenade to your arsenal.
Regarding passive skills, focus on stacking projectile damage and increasing cooldown recovery speed during this phase; this ensures Flash Grenade is ready sooner, thereby boosting your overall projectile damage output.
For defense, prioritize pure armor; evasion rating is not a concern at this stage. It is worth noting that Essence of Virtue, a new talent for Gemling Legionnaire, will prove highly valuable for defense later on.
Also Read: FPS Boost! Recommended Graphics & Game Settings for Path of Exile 2 0.5.0
Act 2
Upon reaching level 22, you can acquire Explosive Shot and enhance it with Double Barrel support gem. Simultaneously, upgrade Multishot 1 to Multishot 2 and apply it to Explosive Shot as well. You can now remove Permafrost Bolts and Fragmentation Rounds from your setup.
In Act 2, rely primarily on Flash Grenade to handle enemies; use quick taps of Explosive Shot to finish off any stragglers.
When facing elite monsters, throw two Explosive Grenades in quick succession, then rapidly switch to Explosive Shot to detonate them for a burst of massive damage.
Before defeating Jamanra, the Abomination, remember to adjust your passive skills to enable instant reloading for Explosive Shot. To achieve this, utilize the weapon-swapping mechanic to gain bonuses for both crossbow reload speed and grenade damage.
Act 3
Vendors in this act will begin selling Bombard Crossbow; you definitely need one, as its effect allows grenade skills to fire an additional projectile. You can also combine three crossbows at Reforging Bench to craft a superior version.
Next, add Oil Grenade skill to the build. It lowers enemy elemental resistance and grants you bonuses from Persistent Ground and Potent Exposure.
If you have spare support gem slots, equip Magnified Area to this skill, and use Jeweller's Orbs to secure Elemental Armament bonus for Explosive Grenade.
Additionally, you should incorporate Wind Dancer. The evasion rating it provides on its own isn't particularly significant, but when paired with Blind Support gem, Wind Dancer ensures your survival as you weave rapidly through enemy ranks.
This is because enemies attempting to attack you are countered and blinded, rendering them unable to land effective hits, while you strike them with greater precision than ever.
Even if you make a mistake while dashing and find yourself swarmed by enemies, you can withstand the pressure; your armor provides enough damage reduction to help you turn a dangerous situation around.
Finally, during this act, you can enter Temple of Chaos to complete your second ascendancy; upon completion, be sure to select Advanced Thaumaturgy immediately.
If you have currency available to improve gem quality, I recommend investing it into Explosive Grenade to gain at least one additional projectile.
Viable gear upgrade strategies
While gear isn't critical for this build, if you wish to further optimize it, a good first step in reaching the endgame is to use Abyssal Crafting on your amulet to obtain a modifier granting +5% quality to all skills.
Alternatively, if you have enough Divine Orbs, you can trade for Lineage Support Gem Dialla's Desire that grants +5% quality to socketed skill gems.
That concludes our leveling strategy for Mercenary Gemling Legionnaire Cluster Grenade build. The name might sound a bit complex, but the combat performance is straightforward and highly effective, give it a try if you're interested!
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