Dust is easy on a THF melee although a bit time consuming. You just put the axe away (gasp), take off your guards, equip a scimitar or whatever and target what you're hitting. Sure, you aren't doing the usual damage but you do enough to get through it. Did this a couple weeks ago doing the first part solo, killed no spiders, and was joined by a guildie for the end fight. Got the three chests at the end. A THF toon who doesn't swap the axe out probably didn't know the quest requirements, or doesn't carry an alternative set of weapons. That used to be me but you live and learn (and read these forums for advice).