I took this video offline with cooldown hacks.
If you take enough dmg taken as mana to reach 100%, and enough endurance to max out damage reduced on seed of ekkadrasil (around 180% with a perfect 56% roll) you get 100% damage reduction.
I don't have a level 84 sorc and should really not be spending the time to level one since I've been neglecting my gf/friends/work so good luck to whoever sees this post and buys up the seeds going for cheap on the market and gets rank 1 holding down right click. As an added bonus with over 100% damage reduction to mana, enemies start healing your mana which raises your maximum mana and gives you infinite damage scaling in about 5-10 different ways.
Anyways just goes to show that even this late into the season there are lots of things left undiscovered and it is possible to make your own builds instead of just copying guides.
Youtube:
https://www.youtube.com/watch?v=ipbKXe5hwQE
Build:
https://maxroll.gg/last-epoch/planner/#9f5w506e
edit: yeah patched. Dang the devs are fast on a weekend.
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