It was a lonely life, but one with which Mephisto could sympathize. He shook his head, "The riddle isn't important to your ascension. It would take you repeated readings of it to even catch onto where and what it is. And anyway, it's more a secret than it is a riddle. A closely guarded one, a hidden one. But you are more than welcome to keep digging. Eventually, you will find a thread that leads you to it. I have faith in you. If any being could find it, and understand it on as deep a level as it is, you would be that one. To be honest, I would love to see what you'd do with it."
Mephisto turned his head with a grimace then, and bit back a sensation of discomfort, willing it away as best he could before continuing, albeit a little shaky. "Epiphany it shall be, then. The gradual process of ascension that you've been experiencing throughout this lesson is only leading up to one thing, and that is your ability to... withstand what will happen when I give you the knowledge I possess firsthand. To be honest, I'm not entirely certain I can, in the flesh, but I'll find a way to work around that."