Arcane Ascension

Arcane Ascension summary:

Five years ago, Corin Cadence's brother entered the Serpent Spire a colossal tower with ever-shifting rooms, traps, and monsters. Those who survive the spire's trials return home with an attunement: a mark granting the bearer magical powers. According to legend, those few who reach the top of the tower will be granted a boon by the spire's goddess. He never returned. Now, it's Corin's turn. He's headed to the top floor, on a mission to meet the goddess.