Cast while channeling scourge arrow/toxic rain/herald of agony

https://pastebin.com/np46WsHz
hi guys test new build on delve league have a idea for pathfinder cast while channeling combo skill : scourge arrow/toxic rain, and herald of agony damage support with despair curse effect maybe can some one help me to complete this build. thnx for ur time

some one if can help me with items and some fixes on passive tree. Defence skill gems is Immortal call cast when damage taken support gem.

Yriel's Fostering
Exquisite Leather probably im gonna use that armor it can be good with snake minion+ heralds of agony minion for support at boss killing and hight single target damage

what spell do you trigger with scourge arrow again?

i think about essence drain set up with wither

Just a heads up: Cast While Channeling specifically casts a spell linked to a channeled ability. Toxic Rain is not a spell (it does not have the "Spell" tag) and will not be cast while channeling Scourge Arrow.

I only say this because you have Toxic Rain in the SA-CwC 6-link and it doesn't benefit from being there - it should either be in its own 6L or in a 4L.

oh okok i willl try other skill like essence drain maybe ty.