It would be great to have new class in future, that would be based(or, at least, include some skills) on transformation. Somehing like Druid in Diablo2 or Dragon mage in Sacred 2.
For example, if I am not mistaken, our protagonist has some traces of aetherial power in him. What if this class would be something like a “Flesh sculptor”, who uses those traces of Aether to morph himself into various form, grow bladed hands and so on, like the aetherials do.
Or, maybe, some sort of alchemist, who attains features of notable monster types, and turns in a chimera-like ubermonster as a final skill.