Ranger
PathfinderPoison Pathfinder is a build that deals tons of damage with a simple playstyle. All you really need to make quick work of the entire campaign is a bow with some good physical damage rolls, so this build is a terrific league starter!
The build scales extremely well in the endgame. It easily clears all content, including high-tier delirious maps and uber pinnacle bosses.
Useful Uniques
Slivertongue - Can be used from Act 3 through Tier 15 maps.
Plaguefinger - Allows elemental damage to contribute to poison magnitude. Super strong in early acts.
Snakebite - Gives +1 maximum poison stack, allowing for more single-target damage on campaign bosses.
Act 1:
Cast 
Lightning Arrow to clear packs of small enemies and combo 
Lightning Rod and Lightning Arrow to kill bosses and rare monsters.
Use these skills until level 14 (The Executioner). The limitation of one poison stack at a time makes 
Poisonburst Arrow weak in early Act 1.
When you get your first Spirit Gem for killing The King in the Mists, take 
Plague Bearer. You will use it throughout the campaign.
How to Clear Zones:
Cast Poisonburst Arrow. Use Plague Bearer against large packs of enemies.
How to Kill Bosses and Tanky Rares:
Cast 
Gas Arrow. Fire 
Toxic Growth into the gas cloud until it dissipates. Use Gas Arrow again and continue casting Toxic Growth.
You can also use Plague Bearer to trigger Toxic Growth pods.
Endgame Version
You can find an endgame version of the build here: https://mobalytics.gg/poe-2/profile/pathofevening/builds/poisonburst-arrow-pathfinder
