"The Over Grown Lush Cave"

The idea is simple. A lush cave that has a rare chance of being generated as a Over Grown Lush Cave.

1.This lush cave would be spotted from the surface by a giant Azela Tree 

3.In the lush cave there could be a new wood type Ancient Azela Logs which are a purplish colored wood

4.The primal blossom. This could be a hostile plant that looks like Spore blossom but the spores will give poison and hunger to the player and gives the wither

5.The Ancient Axolotl, would be able to damage the player but if you stun it and feed Azela fruit it would be a pet that could clear any negative effects from the player. It is also the size of the player foe ten seconds

6.Azela fruit would be a new food source that gives a new effect Peace, Peace could give you saturation and restoration for 3 seconds.

7.You could add some many new plants like the vense fly trap, poison ivy, and glow chutes.

8.Also in this cave you could add the Jumping spider which can be tamed or killed for Jumping Silk which  you can craft jumping boots but if you tame one it will act like a dog and will jump at hostile mobs

This biome has a 25% chance of being generated and it has a higher chance of generating diamonds. Hope you think this is great but it is ok if you don't add it.