Whelp I know its not much but I can't draw anything big atm. this idea is really old but I never drew it.
What is a white tree spirit? A forest spirit is born when a forest dies in any manner (clear cutting etc.) The tree that grows on its back is directly from their heart. During spring, winter and summer, they will wander into other forests and gather nutrients for the tree on its back. (No it doesn’t kill other forests) During fall, the white leaves will begin to fall and they will return to the dead forest. The leaves fertilize and disperse seeds into the ground. As the forest grows bigger, so does the tree on their back. They continue this routine every year until the forest returns to its former state. Then the spirit will become overgrown with the roots of the tree. It will go to the middle of the forest and sleep as a tree forever. The tree remains white however its main abilities fade. At night the tree glows. Other things: They have no emotion (unless a disorder occurs which is very rare) They will bring small animals in their tree to another forest until they revive the original. The tree on the back differs depending on which forest they came from. They are not visible to anything but the animals of the forest They cannot be harmed but can harm They are white and never any other colour. The sleeping tree sprit will awaken again if the forest is attacked and then attack the individual or group