Heretic Gold cleared!
https://prnt.sc/l20uhdHere is a pretty detailed walkthrough of the run:
Wow. That was... epic. There's no other way to describe it. There isn't a lot in this game that is of this scale - the only things I can think of are VGT and the Triple Quests. You described it perfectly - this is a brutal challenge that requires absolute mastery of the game and the Heretic class, and also requires very deep strategic thinking. Rather than the normal decisionmaking that takes place during the run, a lot of this challenge is just figuring out how to approach it - and the fact that there are apparently multiple ways to do this is mind boggling, given how much preparation and planning went into this run. Hats off to you guys for making this - I enjoyed it more than anything else in the game so far!
EDIT: @Avatar: Well, no, since I was working on this instead.

I might pick them up again before starting on the East, but I want to unlock more items as well...