Emperor Grym is the leader of the Jyn Empire and the main antagonist of Crystal Warriors, he led an invasion that shattered a peace that had lasted for nearly a century over the continent of Tyramus.

He did so by stealing three of the four Elemental Crystals that had kept the world safe, using them for his own evil whim - yet he became aware that Princess Iris had also went missing and that she must of taken the Fourth Crystal with her.

Thus the Emperor flew into a rage and sought out the Princess in order to retrieve the final Crystal and fulfill his dream of conquering the world.