Current PoB:

https://pobb.in/auFxHXDVMLrr

Day 2 Build Overview:

https://youtu.be/hsaLwrxObKs

Planned PoB for Day 1

https://pobb.in/hekI6gArVl9e

Bane for clear. Blight or Soulrend for Single Target

Leveling Section

Act 1 Regex

b-b-b|g-r|r-g|nne|rint|Flam|Lord|Earn|Wani

Act 1-3

Rolling Magma (Level 2-27) - Elemental Proliferation - Combustion

Holy Flame Totem - Infused Channeling

Flame Wall

Act 3 onwards

Soulrend (level 28)- Controlled Destruction - Efficacy - Lesser Multiple Projectiles/Greater Multiple Projectiles

after you use Bane for clearing you drop GMP and use Void Manipulation instead

or you use Blight for Singlet Target:

Blight - Controlled Destruction - Efficacy - Focused Channeling/Infused Channeling

Focused Channeling doesn't exist in PoB yet so I can't put it in there.

Essence Drain - Controlled Destruction - Efficacy - Void Manipulation

Bane - Despair - Controlled Destruction - Efficacy/Void Manipulation

Bane (with Whispers of Doom) - Despair - Punishment - Controlled Destruction/Void Manipulation

After 3rd Lab

I would clear with Soulrend until you have the Ascendancy Notable Profane Bloom then you switch to Bane.

For single target either use Blight or Soulrend. I wouldn't recommend doing Blight in campaign since this skill needs investment in Cast Speed and some Skill effect duration.

Utility Gems

Shield Charge - Faster Attacks - (Momentum)

Flame Dash

Withering Step (to apply Wither)

Flammability (before Chaos DoT)

Despair

Once you have Whispers of Doom: Punishment or Enfeeble (Defence)

Aura Gems

Herald of Thunder (Act 2, remove after Malevolence)

Malevolence (Act 3)

After you get Eldritch Battery and have enough ES to sustain your mana cost also add either Grace or Zealotry. In maps you will need to use Grace.