Lightbringer series (Brent Weeks)

Gavin Guile thought he had five years left--now he has less than one. With fifty thousand refugees, a bastard son, and an ex-fiancée who may have learned his darkest secret, Gavin has problems on every side. All magic in the world is running wild and threatens to destroy the Seven Satrapies. Worst of all, the old gods are being reborn, and their army of color wights is unstoppable. The only salvation may be the brother whose freedom and life Gavin...

"The Seven Satrapies have collapsed into four-and those are falling before the White King's armies. Gavin Guile, ex-emperor, ex-Prism, ex-galley slave, formerly the one man who might have averted war, is now lost, broken, and trapped in a prison crafted by his own hands to hold a great magical genius. But Gavin has no magic at all. Worse, in this prison, Gavin may not be alone. Kip Guile will make a last, desperate attempt to stop the White King's...