Started a fresh world on Beta then moved it to normal. Got to Bonemass last night wearing t4 iron armor and using t4 mace. Pre cleared the area and once morning hit I engaged. Took all of 4 minutes just bashing when he aoed poison. Ran around the Cauldron a couple times killing the adds. Used 1 stamina and 2 Heal potions along with the initial Poison one. Felt real easy. But like others said experience may have played a role here. Not sure. Only second time I killed him and the first was a long while ago wearing t3 silver and mountain food pre H&H. Oh BTW I ate Turnip stew, Sausages and Deer Stew for this time.