A “Lost World” Ancient Biome Preserved Underground

Many ponder a way to expand on the sniffer feature. We want more, and answers for that manifest as: a new dimension, “nether reactor” kind of mechanic or maybe a time travel machine (k). These do seem more immersive, but maybe also superfluous. So having the features all inside one place/biome could work better. Tho functionally working as a new dimension (if we’re talking about subverting expectation and new mechanics), but inside the Overworld. So, If you have a sniffer a kind of “zoologist” villager appears. After some ancient relate trades you get a map to the “lost world”. Many blocks away from spawn you’ll find an ice surface biome, with drill-like stations scattered around. Pillagers are opening holes to purge the place’s resources. Inside, you can free some of the creatures the pillagers captured. That’s a very classic trope, it works well thematically. The mobs themselves don’t have to resemble dinosaurs. Just modify classic-like mobs. The sniffer is basically a mutant dog. Simply have a pufferfish being purple, big and a flying mob while it retains the poison or something idk. They should just fill different niches. Also, maybe that’s the place where pillagers are taking ravagers from, made total sense to me. Give the plants some character too. Maybe a trap plant with an effect that makes a group of before harmless tiny bugs chase u while hearts pop out of their heads, since you smell like their food now. … Dynamically like a new dimension, bounded by new rules.