Revive crystal

The revive crystal, or birdie crystal, is a crystal found by jude when he was still in human form. It appears in only one in 1 trillion trees. When jude finally found it, he had so much power that he created an entire dimension. He named it birdieland, but many years later he discovered that this dimension was already existing and his birdies were invading it. But before he could fight back, the birdie god killed him. The birdie crystal was the only other thing to come between the dimensions, turning into the revive crystal. The revive crystal is what causes the birdies to revive 10 hours after being killed. A future series, birdies on earth, features birdies during a mishap which sends them to earth to face the threats of the real world.