Originally posted by Cian:

You can actually use two worlds - kill the bosses in one and bring their trophies back to another. I did that just for fun after beating the game normally. I killed all the bosses a second time and stuck the trophies in a second world. In that world I have access to all the boss powers, but only get animal attacks at my base.

I do basically the same. One world for progressing, and one without boss-killing for having fun and building peacefully. The events CAN ruin your fun from time to time. And Fuling in Meadows can, too. It's just more logical that all the enemies stay in their own biome. I mean, what do you with Blackmetal after a certain point? Eat it? You can't even build arrow heads.