Hey it's TPB, this build is a ton of fun to play and is a great mapping character. I'll be league starting as this, and it has a full progression on my Maxroll article if you like to digest information, or need a bit more guidance on upgrades.

Video Guide: https://youtu.be/PZMM2LDvs2g

You level as Pconc occy until level 88-90 and swap when you have cast speed everywhere, a large phys, a chaos medium, crit medium, a mana reservation smallcluster, a despair on hit ring, a life gain on spell hit shaper ring, and shaper gloves rolled with faster casting. It sounds like a lot but half the gear is caster reforges, and the rest is alterations. If you need full crafting notes for everything checkout the article :)

Video Guide: https://poe.maxroll.gg/build-guides/bladefall-bladeblast-occultist-league-starter-guide

POB:

Leveling + Early Game - https://pobb.in/2lpa7uWKn_gH

Mid Game - https://pobb.in/McNK1_-iArXl

End Game - https://pobb.in/iBQu0Qkavv38