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Flameblast / 
Oil Grenade build for 0.5.5, trying to focus on speed and clear, as this build already has a ton of damage built in. Opting for a 
Cast on Dodge setup with gemling for a speedy setup.
You'll level as the very powerful grenade merc setup and once you reach lvl 52 you'll swap to Flameblast, you cannot swap any earlier because Flameblast is a lvl 52 gem.
Keep in mind this build will require a respec at lvl 52, which will cost around 30k~ gold, so don't waste gold in campaign.
Vendor Regex:
"!Item Class: (One Hand Maces|Two Hand Maces|Quarterstaves|Spears|Bows|Quivers|Shields|Bucklers|Sceptres|Foci|Wands)" "s: (am|ri|be|Cross)|movem|[edgl] to.attack|[2-4]\d% to.*res|to.*(int|dex)|^\+.*all sp.*ls$|^\+.*re sp.*ls$"
Lvling filter: https://www.pathofexile.com/item-filter/rkyBKzHX
Only use until you get to maps.
Early boss kill order for a smooth experience:
Devourer(Mud barrow) > cold witch(Clearfell) > hut witch(Grelwood) > rust king(red vale)
If you're more experienced, feel free to skip devourer. Devourer gives an extra support gem around -2 minutes, it's quite valuable for players who struggle in act 1.
For campaign you're just looking for basic gear with life+resist, generally resist is more important. For rings/gloves, these are pretty good pieces to pickup flat damage to attacks, as it'll boost your damage a lot.
For weapon you just want the highest damage crossbow you can find, note attack speed doesn't matter because you're a cooldown based build. In redvale you should get a 
Tense Crossbow, at lvl 10 you should pickup a 
Sturdy Crossbow. At lvl 16 you want yo fully invest into a 
Varnished Crossbow, meaning you'll regal or alch, use 2 artificer orbs and use 2 runes (iron or storm rune). Since you wont swap this crossbow out until lvl 33, you preferable want one with good rolls before fully investing into it. %phys crossbows offer the highest DPS.
For boots you're looking for movement speed, it's an extremely important stat, I would never use boots unless they have movement speed on them.
Body armour is generally the best piece to get defense from, high armour or armour/evasion hybrid is usually the goal, armour is generally really strong in campaign.
Flask: Remember to constantly upgrade your life/mana flask throughout campaign, you can always buy a new one at the vendor when you meet the lvl requirements for the next tier (lvl 10, 16, 23, 30, 40, 50 and 60).
Important: Save all Gemcutters Prism(GCP), these are mandatory for Flameblast swap at lvl 52.
You'll also need to Save a couple of skill gems/support gems for the swap at lvl 52, but this should be easy since you don't use that many skills.
Support Gem Requirements:
Str 15
Dex 20
Int 0
Crossbow Shot
Explosive Grenade
Flash Grenade
Gas Grenade
Frost Bomb
Herald of Ash
Pounce
Multishot I is your highest priority for all skill gems in act 1 that can utilize it. Keep in mind the multishot in 
Crossbow Shot is a placeholder for gas grenade (so only cut 3 Multishot I and at lvl 14, you swap your crossbow multishot into your gas grenade).
Early support order:
Multishot I(Explosive Grenade) -> Multishot I(Flash grenade) -> Elemental Armament I(Explosive)
You'll need a talisman in your weapon set 2 to utilize 
Pounce, this is optional but it's extremely strong for mobility in the early game.
Flash Grenade is mainly for trash packs, and you'll rotate 
Explosive Grenade and 
Gas Grenade for bosses, with enough CDR nodes you'll never run out of grenades to use. You'll also want to press 
Frost Bomb once every 8 seconds on bosses to keep up your exposure debuff, which is a big damage amplifier.
Attributes nodes are just generally whatever you need at the time, it's important to lvl up frostbomb for act 2 or else the exposure will stop applying, which will be a massive DPS loss, so I opt for intellect when available. Thanks to 
Curved Weapon and Colossal Weapon attributes are generally really easy to handle on this build.
Ascendancy order:
Essence of Virtue -> 
Advanced Thaumaturgy -> 
Implanted Gems(int) -> 
Gem Studded
Dousing Charm
Headhunter is not good for this build and the buffs it provides can brick your ignite.-How do I get more skill slots?
With 
Unset Rings and 
Augmented Flesh. You can snapshot skill slots. Put on your rings/amulet, equip your skills and than take them off. While you wont be able to use the skills, they will still count for stuff like Gem Studded and Essence of Virtue.
To balance Gem Studded, just make sure all the gems at the top are equal, but exclude gems in your staff skill as those do not count towards the total amount.
-Where do you get all of your gem quality from?
5% from 
Fox Idol
5% from 
Paragon Anoint
5% From Amulet suffix (desecrated modifier)
6% from gemling small ascendancy nodes
20-23% from Gem quality
This will give you in total 41-44% quality.
40% quality is pretty important as it's a breakpoint for some skills, 
Arctic Armour armour will gain 1 stage (and another +1 stage if you get gem lvl 27, for a total of 8). Quality is also a massive damage multiplier for Flameblast.
you cant have 2 rune of jiqanis on you
There is only one, the other is a Fox Idol
so im doing this build but i have an issue with the skill/spirit skills i have all the skills upto ice shards but the rest i cant fit have i done somthing wrong why is this?
Question about the passive skill tree:
What shall i invest invest in:
Strength, dexterity or intelligence?
Flameblast on weapon set 1 and oil grenade on weapon set 2. Everything else is on both weapon sets?
This was my first time building a character based on a build, and it all worked out—thanks for the build.
But my FPS drops really badly. (RTX 5070TI)
During leveling, this build kinda feels like playing Junkrat in Overwatch.
And you’re still trying just as hard to hit the enemy :D
Very detailed guide, thanks!
idk what i’m doing wrong i’ve followed all the steps and gotten all the gear skill gems and support gems but it still hits like a wet paper towel how do i use this build
this might be stupid, but do yk u have to switch weapons between oil grenade and flameblast?
And fully charge flameblast, at full charge it light up a bit
is later going for blackflame covenant to scale it more with chaos worth it?
beacouse my flame dont start please
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Gemling Legionnaire
