The Old Cave
This maze is located by entering the Green Button Door, and being a friend of nature. (Planting all 8 different seeds.) This releases the lock on the door, which has been sealed by magic. When you enter through the door that is sealed by magic, you will enter into a room filled with Tall Anthonys in flower plots. Passed this area is the door that leads to the Maze of the Root.
The Maze of the Root
This is no ordinary maze, as inside of it, has an extreme amount of doors that teleport you to another door in the maze when you have stepped through one. There are flying bat like monsters in the maze, which drop the Item "Monstrous Visage". These bats do not pursue you, though do fly straight down a corridor when you have approached it. They deal roughly 74 damage if you have 101 armor. There's estimated to be about 35 doors, each of these doors takes you to another door in the Maze. Though, one of these many doors does take you to the next Level of the maze.
The Copper Labyrinth is also uncommonly found here.
Finding the correct door will teleport you to a mimic of the maze. Everything is exactly alike, until you realize that there are rat tokens in places you've already checked, and a few items like plants and candles, as well as the entrance is missing. Another notable difference is the floor.
If you enter the wrong door on the Level 2 portion of the maze, it may place you back on Level 1. It's about a 50% chance if you were to start selecting random doors. When you reach the next level of the maze, the total amount of doors are reduced, as well as relocated around. There is a trap-room that teleports you to a Clown in a very small space. The only use in such room appears to be the Rat Tokens lying about inside.
Though, if you don't want to experience this for yourself, and want the exact way to the end. Here's a video:
Upon navigating your way successfully to the end, you will be awarded a Nature's Wrath Spell Book by walking up to the podium with this Spell book on it, and pressing E to obtain it. https://fantastic-frontier-roblox.wikia.com/wiki/Nature's_Wrath_Spellbook