Game Drop Idea: Vivacious Void, Part 1--Biomes

Vivacious void is a game drop idea I made. I'm splitting it into multiple parts due to its size. This first part covers the biomes: the chorus and echo forests.

The chorus and echo forests introduce purple and green wood to the game, respectively. Echo trees can also be grown into large echo trees, but with an inconsistent size, having these size ranges: dark oak (50%), spruce (30%), jungle (20%).

The biomes are relatively rare, with 1 in 6 large outer end islands having a single one of them on average. There are multiple variants, with the normal ones being quite sparse, with an average of 1 tree in a 12x12 area. 1 in 3 of either of these (1 in 18 islands) will be a lush variant, which has around the same density of trees as a normal Overworld forest, with lush echo forests having around 2 large trees the size of a dark oak tree in a given 35x35 area on average. 1 in 5 echo forests (1 in 60 islands) will be a thriving echo forest, which has a great density of trees, with large echo trees being very common, and even has some chorus trees. These low odds are meant to be a compromise between the players who want the End to be lush and those who want it to be barren.