The Forgotten Knight told you that finding an alternate version of yourself that is on the verge of dissipating into nothingness can yield enormous power. She opened a gate to a place where these time lost shades congregate and instructed you to find one of particular strength.
You entered the Realm of the Forgotten and found the shades of time lost masters. They beckoned you forward and spoke of the power they represented, the power that lies in your potential. You made your choice, the flood of potential lives and futures slammed into your mind. The sensation passed in an instant, but now these memories reside like a shadow behind your own.
Upon returning to the Forgotten Knight congratulated you for her victory in her usual tone, but despite this, you can tell the gravity of the experience. She bade you return to Gaspar and continue on your quest.