Regarding a Poe Ninja build I found, can't figure out how it works

Here is the build from user xalxixinhaDELVE : https://www.pathofexile.com/fullscreen-passive-skill-tree/AAAABAABAQDBBbUGdwjUDPIPxBBiEcIZihqNGo8dqh3CHvAfWyLqI18knST9LL8tqC3EL2831Dt8Ps9GcUcGSOVQQlFHUilTMVM1VeBYWlsmW29iWmNDbAhwUXBScLtzbXZve257136wf8Z_-4MJg_GEU4TFhweJ04w2jb-P-pMnlwaXIZu1ndmgQ6EvoqOkFqXLpq-m-KxGsZCyKLQMtMW3dbfWuMq5k73mvoC-isF8wcXC7MMJwzrEosrT0NDUI9hU2RPbWdvn35jhiOdU6Nbr9ewY7T_v_fD58YryHfLh9tr7Cf_e

he has Pain attunement + CI, and has barely any increase to ES%, how does it work?

update: Just realized it's the unique belt. However, another question has emerged, why does he take perfect agony?
DaFirenze 님이 2021. 1. 25. 오전 6:30:00에 마지막으로 편집
마지막 추천 2021. 2. 5. 오후 6:15:09
next time, post the poe.ninja link so we can actually see what's going on. A tree without items is not much use :P
He probably uses timeless jewels.
Judging by the character name, I assume this is a deep delve build which are very specific for that content

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