I also think that iron mace is the best weapon against stone golem, but, like bonemass, they're so slow that you can kill them with anything. It's just a question of how long it takes.

I also tried killing an abomination with an axe, with very mixed success. The problem was that I couldn't hit it.

With a sword, I kill the abomination by parrying it and then jabbing it with the secondary attract. It doesn't take long, and it's relatively easy if you can get the parry timing. Miss that too many times, and you're swamp goo, but if you hit it, the follow up with the sword pretty much always hits.

I tried to use the same tactic with the bronze axe, and I think I landed with the axe once or twice. It seemed like the slow attack speed of the axe was throwing off the timing just enough so that, after a parry, the time it took to move back into position from the knockback and swing the axe meant the abomination was already raising for the next attack. The swing just whiffed underneath him.

I had to drag another troll over to help me finish him off. They are really the most helpful mobs, Always lending a hand when you need it.