This novel is a book I'm writing about what might happen if Adonalsium was put together again.
On their Sixteenth birthday, people can go through Ascensions, which are essentially Brandon's magic systems. Sixteen months from their first Ascension people can go through their next, and so on.
The first Ascension is Allomancy, the second Feruchemy, then AonDor, then Epic powers, etc.
Unfortunately almost everybody who reaches the Fourth Ascension is incredibly evil as Epic power corrupts them. This causes a BIG problem for the Cosmere and the worlds of Non-Cosmere.
1/16th of people reach the 1st. 1/16 off that reach the 2nd.
The final is going to be the 16th, which only one person possesses-a man called Gregor.
(New Ascensions appear whenever Brandon writes about them. The Universe was fine until Reckoners...which is the end.)