It’ll just skip over and treat it like you’ve done both I believe. That or it stops the mountains biome raids. Not really sure. Bonemass is definitely the most optional boss of the bunch though. You can find plenty of silver without him and most other things you can find with the wishbone are crap/optional. Definitely won’t break anything.

Technically speaking, Moder’s drop is the only mandatory one to unlock things. Getting Iron without defeating The Elder is a chore and a half as it’s a low chance drop from Oozers and can be mined in small quantities underground in swamps, which are hard to find without the Bonemass drop. If you cheese enough copper using a Troll, you can get the copper needed to make a pick without Eikthyr. However, there’s no alternative to killing Moder for the special bench to get the final tier(for now) stuff.

Variations on this get asked alot so I'm borrowing someones info from another thread.

Originally posted by vinyblaster:

This page: https://valheim.fandom.com/wiki/Events describes the *trigger* and *disable* conditions for an event. For example, The Forest is Moving starts happening after the 1st boss is dead and ends once the 2nd boss is killed.

You'll see there are several flavors of events that don't trigger until bonemass is defeated. It's nothing gamebreaking.

I'm one of the people that sometimes skips Bonemass and it has a huge benefit of never enabling the 'you are being hunted by wolves' event, that I consider to be one of the most dangerous because it can happen anywhere.

You should note that killing moder will enable 'the goblin army attacks' event. If you have been getting by with so-so defenses before, you might want to upgrade things.

Youll get thede events : troll raid , drawr+skelleton raid , bat raid ( farm killers ) , fuling raid