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MercenaryThis is a build guide for purely progressing through campaign and getting to T15s. The idea is that you swap to another endgame build at that point.
This is one of the fastest leveling builds for 
Witchhunter, 
Tactician, and 
Gemling Legionnaire. It's the same build that I used to win an Act 4 Boss Kill Race, and finish the campaign in 4 hours.
Click here to get the filter. Alternatively, you can follow the "Grenades Leaguestarter" filter here.
This will be your setup for the majority of Act 1. Your goal is to get to level 14 by the time you start fighting Geonor, so that you can use 
Gas Grenade.
Vendor Regex (make sure to copy quotation marks as well): "!(uiv)" "cross|mov|[egdl] da.* to a"
Don't spend any Regals, Alcs, Runes, or Exalts until Act 2. You're saving them for the level 16 
Varnished Crossbow
Weapon: Click here for a very detailed guide on how to get great weapons throughout campaign. Having a great weapon versus having a bad weapon drastically changes your damage, so I strongly recommend reading it.
Boots: Movement Speed > Resists / Life / Armour
Rings/glove: High flat damage (preferably lightning damage for shock) > Resists / Life
Helmet/Body Armour: Resists / Life / Armour
Amulet: +# to level of all projectile skills > Life / Resists
Belt: Rawhide Belt with Resists / Life / Armour
Support Gem Requirements:
Str 5
Dex 10
Int 0
Explosive Grenade
Flash Grenade
Attrition
Frost Bomb
Pounce
Set 2
Your first Level 1 Uncut Skill Gem that you get from Renly will be Explosive Grenade and then you must pick up the Skill Gem in Clearfell to cut Frost Bomb.
Make sure to get your first support gem from Areagne in The Grelwood, and cut Multishot I for Explosive Grenade.
First Level 3 Skill Gem (The Rust King): Upgrade Explosive Grenade
Second Level 3 Skill Gem (Lachlann): Flash Grenade.
Third Level 3 Skill Gem (Crowbell): Pounce
Upgrading priority: Explosive Grenade > Flash Grenade
Tier 1 Support Gem Order:
Explosive Grenade.Flash Grenade (which you'll put on Gas Grenade)Gas Grenade (when you're level 14)In early Act 1, use Explosive Grenade and 
Fragmentation Rounds to clear trash monsters. You'll drop Fragmentation Rounds by the time you reach level 6. Flash Grenade is used to help clear trash monsters, and stun bosses. If your gear is strong enough, flash grenade can one shot entire packs.
At Level 14, your trash-clearing rotation becomes: throw Gas Grenade, then Explosive Grenade to detonate it. Throw them ahead and run past so mobs follow into the blasts.
For bosses, cast Gas Grenade, then Explosive Grenade, and continue throwing gas / explosive grenades on cooldown. Gas Grenade has a limit of 6, so before you start using 
Bombard Crossbow, you can cast Gas Grenade twice per Explosive Grenade (rather than once). Once you get 
Oil Grenade, you should throw one out before continuing your usual rotation.
From level 52 for clear, cast 
Cluster Grenade, and you will one shot the screen.
Ascendancy:
This build doesn't require any ascendancy to clear campaign / T15s, so if you're planning to swap to another build in endgame, you can go straight into that.
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