I think the bosses I one-shotted were Iudex Gundyr, Vordt, Crystal Sage and Oceiros.
I think I one-shotted them (though I had seen Iudex Gundyr and to a lesser extent Vordt before I fought them), plus I know I one-shotted Yhorm (but with Siegmeyer and I knew what to do in advance probably because I looked up the Siegmeyer quest) and Aldrich.
I think all of them have killed me on subsequent playthroughs, though. In the cases of Oceiros and Aldrich, probably quite a few times.
And I know I didn't one-shot Greatwood because for the life of me I couldn't get to his weak spot in the second phase without getting wrecked. Pretty sure that once I beat him I've never had trouble since, so I couldn't exactly say what the problem was.
Johnbobb posted...
Also, was anyone else totally let down by Gundyr 2.0 (I think his name was Champion Gundyr)? What a boring waste of a boss
Actually now that you mention it he wrecked me until I looked up a parry timing video. He might have actually killed me more than Nameless. I was using the Washing Pole 2-handed and I couldn't find the timing to land an unpunished hit in the second phase. I might have been playing really late at that point though, so I couldn't say for sure it wasn't just because of that.
Greatwood was literallt just atay at range. Let him fall down then kill his limbs. So easy ---