Diablo 2, 1.09 Patch.
Battling The Ancients with a bow wielding Amazon on Nightmare. Holy shit, this was the most difficult fight so far.
Hit and run seems to be the only valid tactic. Fortunately my Amazon has about 40% extra movement (would have been 65% with her previous bow), so after some reloads I learnt to avoid the Leap Attacks and Whirlwinds. One direct hit with a LA would be fatal.
I watched some YouTube videos to compare, and as usual I was disgusted. Seems the Valkyrie and Merc are near invincible with the newer patches, while in 1.09 they have a very short life expactancy.
Of course, it would have helped if I had remembered that I can quip the merc with weapons and armour...