My goal for this league was to finally kill all 7 of the uber bosses and after playing a few characters i decided to put some currency in my leaguestarter: a Flame Wall Elementalist - and eventually succeeded with uber sirus being the last and definitely hardest one for me.
The core concept is applying the dot effect of Flame Wall with Ball Lightnings shot through the wall, which allows for a very safe playstile, especially in Arena Type fights where you can just run around the edge and burn everything even off screen.
I recorded most of the fights but the videos are too long to upload so here are some short fights:
Conqueror Invitation: https://streamable.com/oa1ech
Uber Eater: https://streamable.com/nyv1ot
Ball lightning also applies 50% shocks and ignites for combustion/covered in ash along with the Flame Wall dot.
This is my final POB: https://pobb.in/e5jngjUpyVq1
Sacrificing some defense i managed to get to around 27m Flame Wall Dot DPS, with another 8m when the Boss actually stands inside the wall.
For mapping i used a slightly tankier version and switched Zealotry for Determination (white socket in devouring diadem) and used jade/quartz flasks. I also had Bastion of Elements instead of Heart of Destruction.
As for the League Start, it was pretty smooth and i could recommend this build if you dont need the fastest mapper and dont mind a 2 skill playstile like ed/contagion. I used it to farm Blight and that fits perfectly for something like this: just standing in the Flame Wall and shooting Balls in every direction.
It's also not the tankiest Build but does have some layered defenses, in the mapping version i had:
28k Armor / 40k Evasion
Petrified Blood with lots of regen from Vitality, buffed Stone Golem and recoup
51/45 Block
21% Phys reduction from Chaos Golem
Bastion of Elements vs ele dmg
Decent Chaos res
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Ashes of the Stars gives a lot to the Build: a LOT of cast speed for alt quality Flame Wall / Ball lightning for QOL, 4 Golems with the buff effect quality and some curse effect for Flammability.
Also the Brutal Restraint is very important since it basically solves all our dex problems and has 7 Notables in radius where you can get Aura Effect, Elemental Damage, Life... Being able to search for good ones is generally super nice.
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If anyone is interested in trying this for a leaguestart you can also see my week 1 progress on Ninja:
https://poe.ninja/challenge/builds/char/klambes/BallsVsWalls?time-machine=day-2&i=2&search=time-machine%3Dweek-1%26skill%3DFlame-Wall
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Edit: Mapping Footage
80% deli Strand: https://streamable.com/3ij67s
Quick Baran Map since i forgot Determination in the above: https://streamable.com/qy5dno