What they are largely governs how they act. In order to be good, you must recognize the difference between right and wrong and strive to choose the right. To be truly evil you must do the contrary. Being good or evil is a choice. “Instead, the creatures of Fablehaven are light or dark. Some are inherently builders, some are nurturers, some are playful. Some are inherently destroyers, some are deceivers, some crave power. Some love light, some love darkness. But change their nature, and without much resistance, their identities follow.