In Skyrim, go to The Arcanaeum, and say in real life:
"Oh Arcaenus, grant me your knowledge on this day, I wish to have knowledge greater then the wisest man in all of Aurbis!"
Then, A demonic entity will appear before you. Do not look directly into his eyes. He will take you into the true arcanaeum, which is a plane of oblivion, where your soul will live there for all eternity. The demonic entity is Arcaenus. Some people say he is a demonic version of your own characters, others say he is miraak without a mask. His appearance various from person to person.
If the Demonic Entity looks like Mehrunes Dagon or any daedric deity, ABORT THE RITUAL. If the Arcanaeum is completely empty and there is nothing in sight, ABORT THE RITUAL. If you manage to see alduin instead of the demonic entity, ABORT. THE. RITUAL.
To Abort the ritual, go to a save data from the day before you attempted to preform this ritual.
To End the ritual, you must say in real life: "Thank you for delivering me your vast knowledge of this universe, but you are now no longer needed. I appreciate this very much." The demonic entity will be in your skyrim game a year from now to test your strength. Fail and you will go to his plane of oblivion. Win and you will gain infinite knowledge.