Xenon Chaos Vellum solo

Well yeah but this guy is like standing a character length or closer away every time. It's obvious, but being that close and only dying once or twice is still impressive.

I disagree that it's impressive. Any job with a flash jump could do it easily, even easier with a rush skill, and stupidly easy with high status resistance to not get stunned by the falling pillars. So xenon is pretty much the easiest job (possibly only job) to do this on.