2nd layer to outer caves

Idea of what thisisgreene posted but instead of having the new area similar to the one above, they should all be different like how the sunken sea doesn't have any sort of ice sub-biome also all these areas would need some type of upgrade to be able to breath in

Azeo's wildnerness -> Root trail
Mossy area with roots hanging from ceiling but also has roots going down further
Many new types of mushrooms can be found and new mushroom wood type
Worm and bug themed creatures with a giant library hidden underneath like a stronghold to the boss a giant spider
Poison fog could be a thing that comes through occasionally needing protection from

Desert -> Jurassic river
Area with blue and green curly moss, elephant plants, lots of light green-orangish fauna
caves formed liked big rivers with dead ends, orange red rocks, pools of oils and lakes of lava
Bug and ancient creatures themed creatures here
Amber found here and petrified trees