The Silent Tempest — Michael G. Manning

The story of the first Illeniel wizard continues. Tyrion's life among the She'Har had become quiet, but the sins of his youth have returned to haunt him. The Mordan wardens have discovered one of his children, and the other groves are racing to find and claim the rest of his illegitimate offspring. Unable to stand by and watch as his children are used as pawns against one another, Tyrion makes a hard choice, one that will set him against everyone and everything he cares for. Others' love had made his children strong, but his hate would make them powerful.