I beat Ys I last night, and holy crap Dark Fact was annoying. He really wasn't too difficult, but it still took me a bunch of tries. Every time I fought him I always managed to get his health down to just one or two more hits to kill him, and that's when I got stuck in a corner where he slaughtered me. Damn those last couple of hits.
Now, onward to Ys II! Why have I never played an Ys game before? This game was awesome!