Originally posted by GunsForBucks:

Pro tip for next time.
Explore the mountains before you kill Bonemass and you won't have to worry about the wolf event.
You can farm up onions, collect frost glands and make frost arrows, collect pelts for comfort items and save the rest for when you get some silver.
By the time you are ready gear wise for current boss you should be at a level you are fine starting in the next biome... why not scout first?

Yeah, that's exactly what my buddy and I have done. We were fully clad in silver gear, some of it upgraded even, with maximum comfort in our base from roaming in the plains. By the time we decided to kill bonemass, it was as casual an event as it would be to go kill Eikthyr again. Jump drank a poison resist potion each, filled up on the many stacks of our best foods and just power attacked him over and over with our Frostner hammers until dead. No dodging attacks, no worry about poison. Hell, we summoned him a few times just to have extra wishbones to keep in various bases for convenience.

You don't technically have to kill all bosses to progress. You kinda have to take out The Elder for Iron and Moder for the artisan table, but there's ways around the other two. For bonemass at least, it can be very beneficial to just ignore him for awhile.