The Derevo are not a race unto themselves but a race of similar species. Similar to the different asian cultures. They are all different yet similar being similar cultures. The Derevo are like that.
The leaves talk and caress the mind of those who are willing to listen. We know what it is they say and it does not bode well for the civilized lands to our west. Woe to them I say, the land will return to it’s natural state one day.
-Enio Lacvite - Knowledge Seeker of the Rred Leaf
A small magical plant with a love for pulling pranks.
If you want to add a "supernatural" touch to your campaign, define the rules of magic and the universe. Make your players comfortable with those rules. Then your new supernatural creatures must then break those rules.