I recall lurking such a challenge thread here
That'd be stretching the definition of intrinsic a little. The Assassin's poison immunity doesn't show up as such from insight/Revelation/death, and cannot be granted by any item. As far as I'm concerned, it is a class power and should be permissible - so should regeneration. Winning is still going to be a bitch even with both
I understand no crowning, but why can't you raise your piety as long as you don't get any luck intrinsics? To "very pleased" to get holy water, for example.
That's the first thing that came to my mind when reading. Better have
lots of healing around, specially for TF:4 where you can't teleport and have to, well, kill the ACW. I'm thinking of farming spenseweeds and pepper petals (and morgia, you'll need extra To), if your character has Herbalism.
Dragons up to ancient kind (non-inclusive) can't see invisible. With an invis source, magic mapping, luck with teleportation and a wish for speed, it
might be feasible.