I tried killing Madanach during "No One Escapes Cidhna Mine" on Expert difficulty. I couldn't do it. No matter what Shout I used, or whether I used my Wind Stone power, he always killed me. Sometimes Borkul the Beast joined in, and they killed me even faster.
After several tries with varying strategies I said screw this, and turned the difficulty to Novice.
Then I (after going back to Expert) Ice Formed the spider in Markarth Ruins, and simply ran past it and everything else.
Ummm sneak attack while he is onda chair?
iv 1hit him twice now doing that...
i dont think iv ever faced him 1on1 though
You think I didn't sneak attack him? I did, it's just that even with all the "Armsman" perks and a 1H skill of 87, pickaxes don't do much damage on Expert. I haven't invested anything in Sneak, so I only get the 3x multiplier.
I know I've one-shotted him before - on Novice, with the "Backstab" perk.
In hindsight, I could've cast Bound Sword - but without the "Mystic Binding" perk I still wouldn't have done enough damage to one-shot Madanach.
Anyway, he's dead now. That's all that matters.