When you are done with the Dream of Elea talk to the mask of Laharra she will send you the Labrinth of Gardians. You must defeat the twelve trials and summons. They're though make sure that you have a strong team at least level 20. Once you beat the trials you will fight the 13th summon. When you beat it you can transform into. Hint: it can paralyze you.
Submitted by Daniel the gamewizard