At the beginning of the game, White guides Benjamin in an escape from a collapsing mountain when the Crystals are attacked by the Dark King. He declares that Benjamin is the hero of prophecy, though he amends it to being more of a guess when pressed. He informs Benjamin of the nature of Focus Tower and the Dark King's intentions.
White appears several more times. Whenever Benjamin asks for guidance, White gives a very brief answer without any details or instructions on how to accomplish it. The first time Benjamin asks him what to do, White only replies "Go save the Crystals!" and leaves on his cloud.
After Benjamin defeats the Dark King, White reveals his true identity as the Crystal of Light. Even though the prophecy of the hero had just been a cruel rumor by the Dark King, White decided to use it anyway.