EDIT - A an asture person explained to me I am wrong about Lethe Shade and I believe they are right. Do not use Lethe Shade on Skin of the Lords. Good options are iron reflexes, iron will, divine shield, call to arms, ancestral bond and more. Find something that's not actively bad. Apologies to anyone who bought a Lethe Shade one, if it makes you feel better, I did too and I killed most of my Uber bosses wearing it.
Videos:
Deathless Witnessed Uber Cortex: https://www.youtube.com/watch?v=MrZvlRGCHoY
Deathless 90 Quant Elderslayers: https://www.youtube.com/watch?v=spbivbVUHZg
Limping through my first Uber Shaper Kill: https://www.youtube.com/watch?v=yYDaxbQxhwo
Limping through my first EoW Kill: https://www.youtube.com/watch?v=6yliXbt9Yag
A bad 60+quant Feared kill because I was trying to solve two problems IRL and kill The Feared at the same time due to extremely bad timing: https://www.youtube.com/watch?v=QYDq9LUM2Us
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Budget (more notes in NOTES section of PoB):
Low (~10-15ex): https://pastebin.com/ikgWwG9Q
Medium (~20-25ex, current): https://pastebin.com/q40S41R5
High (theoretical): https://pastebin.com/uSFHcYU2
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Notes.
This build is a giant crutch designed to turn bad play into kills. I adjusted it to have a metric ton of defenses that are pretty tuned to the Uber Fights (Lethe Shade, 89 max res, 95%+ spell suppression, totems, reasonable armor, ailment immunity, CB immunity etc…). This allows you to learn the fights while fucking up almost everything and still living and doing damage. For everyone saying “I want to kill uber bosses and I only have 25 ex”, I would submit to you that this build is as good as anything out there. I wish I had footage of my Sirus kill, because of how extremely bad I played and still squeaked out a win. If I was playing melee I probably would’ve had <8s of DPS uptime on him in the final phase, but playing totems allowed that to be enough to win because they turn 8s of DPS time into 20 or 30.
I am going to leave it at that because of the large post from last league. Yes you should use Galesight and no you shouldn’t play Hiero instead. Happy to answer questions.