Pathfinder - Zooming & Booming - Explosion Spam & Damaging Ailment stacking

Gas Arrow
+ Corrosion¹
+ Armour Explosion¹
+ Break Endurance²
+ Acceleration

Rain of Arrows (Bossing)
+ Exploit Weakness¹
+ Lacerate
+ Brutality
+ Momentum

Spiral Volley (Clear + Ignite)
+ Heft
+ Fire Infusion
+ Fire Penetration
+ Ignition

1. Required for Armour Explosion looping.
2. Frenzy Charge generation via Resonance keystone passive.

Toxic Growth
+ Martial Tempo
+ Concentrated Effect
+ Execute

Barrage
+ Perpetual Charge
+ Premeditation
+ Second Wind

Wind Dancer
+ Blind
+ Maim

Plague Bearer (Panic button)
+ Chaos Mastery
+ Physical Mastery
+ Expanse

Combat Frenzy (Optional Frenzy Charge generator)

Herald of Ash (Optional Ignite source)

Alchemist's Boon (Bossing)

Attrition (Bossing)

Decompose (Corpsewade Boots)
+ Bursting Plague
+ Comorbidity
+ Deadly Poison
+ Magnified Effect

Common mobs = Gas Arrow > Spiral Volley
Magic mobs = Gas Arrow > Rain of Arrows
Rare mobs = Gas Arrow > Rain of Arrows > Toxic Growth
Bossing = Spam Toxic Growth > *boss spawns* > Gas Arrow > Rain of Arrows

Damage Node Priority:
1. Attack, Bow, Projectile, Skill Level, Crit
2. Damaging Ailments
3. Poison Magnitude
(Physical% increase on the tree only scales gas arrow, not the explosions!)

Gas Arrow poison converts 20% physical & 20% of chaos to base magnitude.
Gas Arrow explosion converts 100% physical damage to fire damage.
Armour Explosion converts 100% physical damage to fire damage.
Rain of Arrows is pure physical damage.
Bleeding ailment is 15% of physical damage as base magnitude.

We can scale everything we use by focusing on base damage first, then ailments, then poison. Don't forget, we are going to be triggering bleeding & ignite as well. So the Damaging Ailment nodes will boost all 3 of them.

I'm not stacking # of poisons with this build. Firstly, I hated having to constantly refire gas arrow when using the straight forward poison stacking build. Because poison stacking nodes come with the trade off of lower poison duration. Secondly, the lower poison duration led to inconsistent Armour Explosion triggering.

To retrigger Armour Explosions without having to constantly re-fire gas arrow, I went with a "1 big, long poison" approach. I removed all +1 max poison nodes to ensure my poison has a long duration & a constant 60% benefit from the Low Tolerance node. This poison strategy has more up front dps, rather than waiting for stacks to build, which triggers Armour Explosion faster. This makes gas arrow usage burstier & diversifies my damage type.

Late game gear provides enough evasion (without Acrobatics) that we don't have to get many evasion nodes. I prefer Blur Reflexes, Bestial Skin & Escape Velocity. Depending on your needs, you can path to these nodes from the +dex side of the branch, or the +%evasion side. You may also path up from Escape Velocity or Feathered Fletching, depending on this decision. The accessible jewel slot is hard to pass up, with most all nearby damage nodes taken.

If you have amazing ES/Evasion hybrid gear, you could probably pick up the Spectral Ward or Subterfuge Mask nodes. you would need to sacrifice some move speed or damage on the tree to achieve this.

Pathfinder has exclusive access to slow immunity, via their ascendancy node Relentless Pursuit. Including attack speed & Movement speed. This makes Sanctum/Ultimatum farming much easier, as you can now ignore a few negative modifiers. Immunity to chill, temporal chains, etc.

Skill speed is also something you can stack relatively high as well. This allows you to use Toxic Growth without getting yourself killed and utilize Plague Bearer more reliably as a panic button. This also leans into the movement speed stacking side of the build in making you zoom with your hands just as much as your feet. It's fun to be fast. But this isn't PoE1 levels of speed.