4Game

Maybe this is an unpopular opinion, but here are my reasons why I think Bonemass should be upgraded in difficulty:

1. Melee attack. This is quite fine, although pretty easy to dodge.
2. Poison cloud. Having poison resistance from the root mask or mead makes this attack rather harmless.
3. Spawn ball. The spawns are a small distraction, nothing more, and you have plenty of time to run to them if you want to kill them instantly.
4. Bonemass communicates all of these attacks quite clearly, so you have ample time to react to each of them.
5. He uses his best attack – the melee – so slowly and usually stands still both before and after the attack for so long that you can get lots of hits in basically for free.

Swamp is the most complete (and coolest) biome, in my opinion, but Bonemass could use a buff.