Ranger
PathfinderOverview:
Gas Grenade create Poison Clouds which are ground surfaces that constantly apply Poison to Monsters within and grow in area over time. When combined with 
Herald of Plague, this build is easily able to clear large packs of Monsters, whilst the Pathfinder's 
Overwhelming Toxicity doubles the amount of Poison stacks, helping to solve single target Damage.
Main Combo
Drop Gas Grenades and immediately explode them using 
Explosive Shot to apply proliferating Poison to Monsters. Against tanky targets, use 
Despair followed by 
Entangle, then stack Gas Grenade Poison Clouds on the mob.
Be aware that the Ratha's Assault Support Gem linked to Explosive Shot will prevent the Skill from being reloaded normally - you need to dodge roll to reload 4 bolts per roll.
Note: Explosive Shot is OPTIONAL. If you prefer to play a one-button build and don't mind the delayed damage from grenades detonating from their fuse timers, you can play without it. Ensure you take 
Volatile Grenades on the Passive Skill Tree in that case.
Supporting Skills & Defences
Herald of Plague is used to provide Poison proliferation, allowing for smoother map clear - you can play without it, but I recommend using it as it prevents some backtracking for loot or getting bodyblocked in narrow areas. Despair will lower Monster Chaos Resistance, making them take more Chaos Damage from Poison, whilst 
Withering Presence applies Wither to nearby Monsters making them take increased Chaos Damage. Entangle is used to apply both Critical Weakness and Withered for single target Damage with the weapon swap setup.
This build invests into both Evasion and Energy Shield, making use of 
Wind Dancer and 
Ghost Dance for a fairly stock-standard defensive setup for a build on the right-hand side of the Passive Skill Tree. To help solve recovery alongside the regeneration from 
Ghost Dance, we're using 
Enduring Elixirs and 
Shavronne's Satchel for on-demand Life and Energy Shield recovery.
Levelling:
This build uses a typical grenade spamming setup for levelling, making use of 
Explosive Grenade, 
Gas Grenade, 
Flash Grenade and even 
Oil Grenade later on. The switch to poison-based Gas Grenade begins at the end of Act 4.
Make sure to review important written information for each levelling step under each section: Equipment, Skill Gems and Passive Tree.
Campaign Quest Bonus Choices
- Act 2 Ancient Vows Quest: 30% increased Charm Charges gained
- Act 3 Corpse-snake Venom: 25% increased Stun Threshold
- Act 4 Blank Tattoos: +5 Dexterity, +5 Strength, +5 Intelligence
- Act 4 Goddess of Justice: 30% increased Life Recovery from Flasks
- Act 4 Shark Fin: 30% increased Armour, Evasion, and Energy Shield
- Interlude Seven Pillars: +5% to Elemental Resistances or +5 to all Attributes (replace with 3% increased Movement Speed when Resistances/Attributes are solved in late game)
