correctedhsfacts:

From Hussie’s Formspring:

forgottenhsfacts:

Because Trolls are an insectoid race 

Metamorphosis is clearly a significant part of troll biology, and therefore ingrained in their mythology. They’ve got cocoons everywhere, and are often likened to insects through biological terms. The wings have nothing (we know of) to do with troll adulthood. But have a lot to do with their perception of what ascension should be, which is the culmination of a pupation process. Which is why some may look to fairies as an ideal, or rule them out as fiction on account of the ideal they represent. Ascended trolls in this game are essentially magical fairies.

Humans do not have a good analog for this though, and enjoy no biological upgrades. Only powers and fashion.