Originally posted by Luminous Dark:

I just looked it up on the wiki. Apparently they begin spawning in the meadows at night after you've defeated Eikthyr. I guess if I want peace, the next time I start a new game, I'll just not defeat Eikthyr. I wonder if they'll still spawn if I defeat the other bosses but not Eikthyr

Become an inter-dimensional Viking who rules multiple worlds.

I have a transfer material base setup on a world with no bosses killed and it's pretty chill. Poor boars and necks just can't help but run into the dverger spikes. it's pretty amusing just standing on the marble deck watching it.