Wroshyr trees

The wroshyr trees of the planet Kashyyyk, home of the wookies, are noted for a few key attributes.

Firstly, the enormous size of these trees (they are known to grow miles into the air) is what allows entire metropolises to be constructed within their branches, and in this way these cities are protected from the untamed dangers of the Shadowlands, or the surface of the planet.

In addition, wroshyr trees seem have the uncanny ability to merge with one another. At key points, the branches of seperate trees can link together to form a single branch. This unity is taken by the Wookies as a sort of divine symbol of the power of unity.