Chromatic

Light is Found in Every Hue
Magus is dying from the inside out, and only the destruction of the barrier can save it. Even color magic can't defend against earthquakes, strange weather patterns, and erratic wildlife behavior.
After discovering hundreds of captive Yellow magic-users, Ava and Elm fight to set them free. However, new dangers and unexpected enemies await at every turn, forcing them to face their greatest challenges yet. The calamities inside the barrier slowly manifest in the outside world as well, pulling citizens from both sides of the battle into the fray. In this new war, they may not all make it out alive.
Elm and Ava must confront the growing darkness and create a future in a world that has been all but stripped of hope. Can Magus be restored, or is it already too late?