Introduction
Purifier (Inquisitor+Demolitionist) is one of the classes that exists, since AoM expanison. Both classes supports ranged playstyle and deal elemental damage.
Demo have the auto attack replacer-Fire Strike, while Inquisitor posses Weapon pool skills.Both classes have attack speed. Defensively Inquisitor should be the important class, since Demo doesn’t have much to offer. Inquisitor contrary is support class, with skills like Censure, Renewal and Seal.
My guide is natural continuation to build diary posted by @x1x1x1x2 DW Firestrike Purifier: A build diary from Normal to 170 Glad
Build
GRIM TOOLS LINK 
https://www.grimtools.com/calc/4NOD08a2
Here’s even cheaper version by @malawiglenn https://www.grimtools.com/calc/4NOD04O2
Ranged Playstyle ?
Ranged playstyle is not very popular at the moment and one can argue is weakest. As whole idea is to shoot enemies in distance and kill them before they come. In reality, especially late game with high density, you’re basically melee shooter, you shotgun them in close range. Also ranged weapons roll lower damage. Unlike melee, where DW is better, here DW pistols is not, compared to 2h Guns.
Lightning Fire Strike is more versatile than fire version, pistols are easily crafted and Lightning devotion route offers more stats and RR.
Skills
Fire Strike Our main damage dealer.It is auto attack replacer,it scales with attack speed and triggers WPS(weapon pool skills) Should invest as many points as possible, other modifiers are according to personal taste. Static Strike deals tons of damage, but is random proc.
Flashbang It’s used utility skill. First nod is very good for the DA shred, but don’t have points to use it more generous
Storm Box Used as devotion procer mainly
Termite Mines Elemental RR, super irritating, but will be changed probably in next patch 
Inquisitor Seal Our defensive main skill.Damage absorb is nice,also have offensive element
Words of Renewal Our healing skill,defensive ability is also important,since the build doesn’t have many sources for it
Gameplay:
Put FS on right mouse key and move to left. Cast seal beneath you and shoot enemies. Use Box+Flashbang for debuff and mines for RR. Don’t leave seal, unless is super necessary. Heal with Renewal.
Video with gameplay- https://www.youtube.com/watch?v=cmAFblUQNow&feature=youtu.be
Decide to play against Vala, super nasty boss. She have high lightning resistance and can absorb damage.
Gear
Majority is faction gear:
- Rings- Coven
- Shoulders- Bysmiel
- Chest -Bysmiel
- Relic-Malmouth resistance
- Medal- recipe from Bysmiel reputation
Crafted gear are the yellow items:
- weapons,look for attack speed suffix, Alacrity is cheapest
- belt
- amulet,just excellent,+1 all skills and attack speed
Others:
- Helmet, guaranteed drop,also +1 all skills
- Gloves,random blue,craft random greens with attack speed, if you don’t have better
- Feet,random blue.If you don’t have them,look foe physical resistance
- Pants,Solael green, there base resistances and Life steal is the key
Stats to aim for:
- at least 2.7k OA
- at least 2.8k DA
- at least 10k Health
- all resistances (Pierce,not needed) capped, overcaps are welcomed
- 2k armor
- more than 10 % physical resistance
- 170 % attack speed minimum
- More damage will improve clear speed
Attributes : cunning to equip pistols, everything else in Physique
Devotions
I wanted to test devotion map with some weird route using Tempest.
Also Ultos as T3 constellation. Used Revenant for utility.Mandatory constellations are:
- Hawk
- Hydra
- Ghoul
- Ultos
- Widow
- Sailor’s guide
- One source of flat RR
Devotion route :
- Green
- Quill
- Hawk
- red
- Viper
- Sailor’s guide
- Ghoul
- Hydra
- Revenant,remove red
- Widow
- Wraith
- Tempest,remove green
- Ultos to the proc
- 1st node in Dying God
You can go full Dying God,if you want. For leveling you need damage proc early on, like Tsunami or Elemental Storm. Also super good is Bat.
Leveling
Since AoM not many things have changed,so stick to guide by x1x1x1x2. Fire strike allows you to use the same skill efficiently both for leveling and end game.
Just remember to keep resistances high and DA number, that are not crittable by bosses.
You can select fire version, but many enemies are crazy resistant to it and Bastion of Chaos is excellent place for speed leveling.
End Game Build
Here’s GT link for Dagallon Purifier by @AKDONG 
https://www.grimtools.com/calc/gZwJ4pkV
Or you can choose from compendium. Not a lot of DW Purifiers are posted in FG, so most are sadly outdated 
Recommended beginner builds
Builds by Nery(me)
⚔ Nery's beginner build collection Collection with my beginners builds
Builds by Stupid_Dragon
[DW melee] Beginner’s Virulent Dervish
[DW melee] Beginner’s Forgotten Blademaster
[shield melee] Beginner’s pre-Krieg Death Knight
[2H melee] Krieg Death Knight on budget, the Soul Reaver
[1.0.4.0] Beginner’s melee 2H Lightning Elementalist Old but still deserves a mention
[1.0.4.1] Beginner's ranged Tactician Old but still deserves a mention
Builds by malawiglenn
☄ Collection of malawiglenn's Beginner Friendly builds Collection with Malawiglenn builds
Build by Sir Spanksalot
Sir Spanksalot's / malawiglenn's beginner friendly guide for Phantasmal Blades Reaper still not re-formatted to fit the new forum but the most important things are in there.
Builds by Maya
The Carnival - A Guide to Pets contains all you need to know about pets and contains several budget builds
Build by Udars
[1.1.3.0] Vanquisher Fire Sentinel, semi-beginner friendly and practically farmable Semi budget build around Vanquisher set
Also if you are in doubt,check my guide,how to select a build! https://forums.crateentertainment.com/t/guide-for-helping-how-to-choose-your-build/83484
Fire have more options, like Dual Deviltongue or Desolator. Perhaps dual Barrelsmith?