veiled Biomes/dimensions

Veiled biomes and diemensions could lead into things like enchancted forests, or perhaps even some kind of lost sea biome with new mobs, drops and encounters. some could be more seamless, like somehow ending up in some lost sea, others could be like an actual veil, that doesn't hinder progress or progression forward, but is like an invisible biome, or sort of acts as a way or barrier to unlock to actually get to that biome. perhaps even some other gateway.