Light and darkness wax and wane like the days and nights of summer and winter. When darkness becomes too strong, light will retaliate in full force to bring it back down. But then, then same is true for darkness's reaction to light. And all the while that balance is upended, havoc will reign.  So know then, that pure light cannot last forever.  And the longer it does last, the worse darkness's retaliation shall be.

- Excerpt from the Druith Codex,  Chapter 4