Originally posted by Jaggid Edje:

Have you checked this site[valheim-modding.github.io]? It has yet to fail to produce results for similar questions for me.

I checked it out, but I had a hard time finding the codes for the summoning altars for each boss. Any ideas?
Also, I played around with several of the codes but I was unable to spawn several structures (such as drake nests, stonehenges, etc.). How would I go about spawning such structures?