A creation of Avassh, the Twister of Roots, each Tree of Knowledge is unique. They appear like normal, deciduous tree species, but something about them is alien. Trees of Knowledge are legendary, known to bestow knowledge on those who consume their fruit. There is no way to predict what knowledge a given tree will impart, it may or may not be useful or relevant, but those who eat the fruit know what they learn to be true.
Trees of Knowledge are often the catalyst that lead to the creation of cults dedicated to Avassh. The knowledge they share can sometimes be things that mortals weren't meant to know or truly comprehend, and the distress caused by this information can push them right into the embrace of the Twister of Roots.