Last night I got to level 83 and finally got this transformation skill for Maestros. I am only sad that the recast time is a bit long and the transformation doesn't last forever. Still pretty fun for the few minutes it lasts!
EDIT: Just to make it clear, Miaren, the dark elf in the screenshot, is only there to give an idea of scale. The giant golem is actually my main character, GoldheartXVI, using the skill "Golem Armor" that transforms her into one. 🙂