Book two of the Lightbringer series picks up right where The Black Prism left off, which means things are in a bad state for Gavin Guile. After losing the battle against the Color Prince, the Seven Satrapies are now only six in number and Gavin is on the run with boatloads of refugees. This alone would be a major issue for anyone, but for Gavin it is only one of many. His tenure as the Black Prism is in jeopardy for many reasons, but none more dire than the fact that he has lost access to the color blue. This ultimately means that he is dying.
The Blinding Knife - MtG invades the Lightbringer series.