challenge biomes and dimensions

 These challenge biomes and i.e dimensions would have structures that would go with them and almost have like their own "lore" to them.  these structures, biomes, and/or dimensions would then also have like new items and or blocks, stuff, that could be really useful to the player, and in general, really good or nice to get.  these structures, could also be based, where, if there is some boss, the boss isn't necessarily needed to be defeate( perhaps for some) and the structure could be more about the items and "lore" and thus interaction with the villagers and in response to discovering these structures, though defeating the boss, if theirs one would be an achievement. these structures could be similar in style to vintage story in that like. so this way players could have various points for adventure, when other points may seem more "exhausted". this would also make the world have more of a sense of granduer or maybe even, if more unque, "character's are added, have a sense of closeness with the world, that doesn't dimish the game, just cuz the player has visited the site.