The Deep Forest.

Deep in the caves their will be a forest called The Deep Forest, The deep forest will contain a secret boss that will be summoned if you destroy a tree. Which is actually its source of power. The trees will be deep power logs. Which can power machinery. like redstone and maybe even more. It can be used as wood and it will glow in veins. It can also power redstone still as wood. and it will push players who didnt place it away from it. It will be found at around -30 to - 50

The soil will be a soft but wet and bumpy texture.

Now onto the boss, The boss will be like the ender dragon. It will use the roots of the soil to launch itself up. It will never die unless you destroy all the trees which are its power source. Then you will have to deal with its root minions the Deep Rooters. They can climb in/out of the soil and they will jump onto you slowly causing damage You will need to go into water to get them off you. If you destroy its minions you can finally head onto it. It can launch soil at you causing you to get knocked out if it hits you. You will have to use a bow to hit it. and Knock it out from their you attack it with your sword and then if you do not finish that in time he will use the roots to launch himself back up and he will continue throwing soil at you. If you manage to defeat him he will drop the Dark Shard. you can craft the Dark Controller using 2 ancient debris with the Dark Shard. The Dark Controller will turn soil into deep forest soil and summon rooters..!!