but they are all up to chance. They can be received as a gift from Demetrius at any time or from any villager during the Feast of the Winter Star. If you have either the Shrine of Challenge or Danger In The Deep quest enabled, they can spawn within the first 29 levels of the Mines...
Dungeons, Sun Shrine, Stonehenge, and more are all located here. You can use Structure Blocks to spawn the structure piece, make edits, resave the changed piece to nbt, and then move it from the world's "generated" folder into
Structure now spawn on the world containing the bosses summon item and some loot Here all of them as well as the biome their spawn in Magma king temple[nether]: Inside view: Elder enderman temple [overworld] Inside view: The old one shrine [nether] ...