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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.
Sometimes melts the enemies, sometimes deal no damage at all. Any fix or anyone have the same problem and found a fix?
How do I accumulate 100 Spirit to activate the "Cast on Dodge" effect? At level 58, my maximum Spirit is 60. Help
One of the Interlude bosses drops a thing gives you last 40
This might be the worst build fubgun has ever put out… complete trash
lol stfu
So im on dot cap page. took exactly the passive tree etc. Im in dire need of dex and intelligence, what do i do?
and the gear ofc.
guys currently im at the high end game but oilgranades kinda slow and high CD any advice should i change something from in this skill setup?
if i partial cast flameblast does the oil on the ground ignite for lower damage?
yup, it ignites at whatever stage your flameblast casted at
yes.
I dont understand how to get Flameblast to lvl 40?? Can someone explain pls :)
you dont get it to lvl 40. you get it to lvl 20 (or 21) + whatever passive +skills you have. that is +2 from gemling ascendancy and up to +10 from staff. getting +7 from staff is pretty easy, tho.
what you can get to +40 is the QUALITY of the gem. that is 20% (up to 23%) on the gem itself and then another X ( dont know the exact percentage) from paragon (amulet anoint), amulet node, body armour socket, ascendancy passives.
cant get gem studded gems equal how we gonna do i did all the support gems exactly in the guidea
gem studded doesn't stack any way, you can only ever have one bonus active at a time
If anyone is struggling hard at the respec (52). You gotta make sure you A) have all weapon set passives allocated best you can B) Have skills associated to correct weapon sets and C) Maybe most important, this is a floor is lava build, so you gotta spark the fire and then keep it spreading. Its most limp when nothing is on fire. So you gotta get a fire going then tornado that shih then keep it going. I kept explosive grenade initially to have backup ignition...
I'll amend this to say...i replaced backup grenade with a solar orb on a staff, slapped on ignite, flammability magnitude and considered casting and it makes an decent backup if flameblast is on cooldown. Pyrophite staff
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Gemling Legionnaire
