Tetheri the Verdant

Moss Lich of the The Misty Labrynith Labyrinth. The group defeated his labyrinth after a few days and reached him. Not wanting a fight, the group decided to convince him to make a deal for their safe passage to Wyvernsting. They ended up giving him a Corrupted Flower and some magical rings for this. 

History

Tetheri was once a simple wizard but came across an ancient Evergreen in his quest for knowledge and power. After making friends with this Evergreen by saving it from some locals, he was granted the knowledge of immortality. Completing this ritual he merged with one of the Evergreen's seeds and was transformed into a plant being known as a Moss Lich.
For countless centuries he spent time building defenses to protect the Evergreen's abode. These defenses eventually became known as The Misty Labrynith. Many have ventured in and only a few have ever gotten to see Tetheri himself or the Evergreen. Most have joined his rumored army of plant beings either by force or willingly.