Shades of Eternity
Legend

Retrospective: Castle Greyhawk
Worst. Module. Ever. I try very hard not to be hyperbolic on this blog; I know I often don't succeed. But I am hard pressed to think of any ...
This infamous dungeon is known for some good, a lot of bad and a lot of "great gravy what were you thinking."
So throwing this up for the good folk on enworld in how would you revise it for 5e.
What worked?
What didn't?
What should be simply tossed aside?
What should you lean into?