A part of a tree bark with a tree-grow controller on the inner side.
This is one of the main component of a tree. It has complete control over the growing process. If the controller is broken or missing, the tree begins to grow in a chaotic and uncontrollable manner. In the end, it will resemble a twisted, frightening old monster. Every species has its own type of controller, with a different shape, installation time, and capacity. To identify its location, an optical update to the eye implant should be installed.

(Benefits)
The inner element serves as a computer processor or as an amplifier for it.

(Dangers)
The Kora-controller is the tree's most defended component. In the event of a threat, the controller initiates the defense protocol. Every species has its own defense mechanism; some electrify their bark, others shoot poisoned needles, and still others explode.