One Divided (The Chosen) Summary from Goodreads:
Taught by the White Circle for centuries in the time outside of time, the Chosen learned to control and harness the amazing strength of the three Gifts of Power: the Gifts of Light, Earth, and Mind. Now, they are locked in a desperate struggle against the spreading influence of the evil Fallen One and his servants the Daragon, members of the Chosen who have fallen to the siren song of greater power.
When Ethan's lingering desire to be popular causes him to deliberately disregard the Professor's warning, his brother is forcefully torn from his side amidst smoke and flame by the Daragon and taken to the Shadowlands, the dark realm of the Fallen. With the help of the old Professor, Charrid the gatekeeper, and Calissa, who holds a cold bitterness towards Ethan, they travel to the Shadowlands where they find an unlooked for comrade in the form of the disfigured, hobbled Map. Ethan must traverse the dark mists of the Shadowlands and use his newly discovered Gifts to recover Charles before the bitter taint of the Shadowlands corrupt his soul.
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