Arcane Ascension

From the introduction:

Arcane Ascension takes place on the continent of Kaldwyn, where six colossal towers – known as the Soaring Spires – grant power to those who are brave enough to undergo the tests within. This game takes place in between the events of the War of Broken Mirrors novel series and the Arcane Ascension novel series. Participants can read these novels for a greater understanding of the style of the game world, but this is not in any way required.