Use your favourite features in-game with our Desktop AppThis is my leveling guide for Poisonburst Pathfinder, swap to the endgame guide after campaign.
You'll be leveling as poison from the very start with this build guide.
Vendor regex: "y: \+|ts: S|\d+% i.+mov|ward|phy.*att.*|uiv"
(You copy and paste this into your vendor window, to easily see items you might want to buy)
Check the vendor in town every 1-2 lvls for flat damage gloves, every flat for the build is massive for dps.
You always want the highest physical damage bow you can find, nothing else really matters on the bow because you don't scale elemental damage. 
Artillery Bow at lvl 46 is a big power increase if you get one with %phys (pretty common to find from a vendor or gamble). 
Zealot Bow at lvl 39 is another solid base and 
Cultist Bow is pretty decent after the buff.
Movement speed on boots is also extremely good if you can find them, try to search the vendor every 1-2 lvls. I would never swap out movement speed boots, only replace them with other boots that have movement speed.
Besides that you're just looking for life/resist on gear, but flat damage is the most important on gloves/rings.
!!!!Important!!!!!
Always salvage weapons with quality for whetstones and always salvage items with sockets for artificers orb, this is extremely important for gear upgrades throughout the campaign.
I also personally prefer to vendor all rares for gold to gamble in act 2 and act 3 for better gear.
Support Gem Requirements:
Str 25
Dex 30
Int 15
Poisonburst Arrow
Vine Arrow
Toxic Growth
Gas Arrow
Withering Presence
Herald of Plague
Quality prio: Toxic Growth > Poisonburst Arrow > Vine Arrow > Gas Arrow
Link prio: Toxic Growth > Poisonburst Arrow > Vine Arrow > Gas Arrow
Poisonburst Arrow is your main clear for the whole campaign, will often combo it with Toxic Growth to clear packs of enemies.
Toxic Growth/Vine Arrow is used for bosses or rare monsters.
Gas Arrow will auto proc your Toxic Growth.
Boss rotation: Use Vine Arrow into Gas Arrow and spam Toxic Growth, re-use gas arrow whenever the duration runs out.
Important: Before you acquire Persistent Ground II you have to avoid flat fire damage on gear or you'll ignite bosses which will instantly pop of your Gas Arrow clouds, this is only a very short time in the lvling period but it's pretty important to avoid this.
You'll swap between Withering Presence and Herald of Plague(if you're lazy just keep herald of plague on) - Withering presence is just for some extra boss damage as herald of plague doesn't add any dmg for bosses.
In general just use dexterity for your small attribute nodes. Use strength/int if you need it for gear or support gems.
Ascendancy order:
Overwhelming Toxicity > Path Seeker > 
Running Assault
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