I'm not so sure how to deal with raxgore. Other bosses you probably could just make a bunch of alts, farm them until they are max level and farm arcangrove, mythsong, and brightoak rep to get stonecrusher and use them with your main account against the boss.
But raxgore has that occasional counter attack which could level the entire room unless you are careful and stop attacking when that happens so I'm not so sure how one would go about trying to bot a boss that does that.
If you just want the helm of awe for the boosts it give just go for the cape of awe. The boss is binky (in the first dungeon, right before the dungeon raxgore is on) and he is hard but you only have to beat him once to get the cape.
If you are ging for hte full set well then I don't know what to do. Didn't get them myself