I actually didn't manage QT as a hammerzon spec because we need a ranged skill for the way his fight is.
In order to somewhat survive the beam or mitigate the damage, you'll need minimum 150 flat physical resist (% doesn't matter), 86+ max fire/cold/light resist (88-90 is obviously better), and some sort of absorb. Normally I would say just put on the TU Large Shield, but we can't. So hopefully you've got another source. I went and did Judgment Day before going back to QT just for that absorb bonus.
Why can't we use TU Large Shield? You'll want to ornate-craft an amazon-class shield to get the Thunderstone oskill, and get some spell damage if possible. It's a pretty long drawn fight, but this is the safest way because we can't get into melee range.