Now you have to live the rest of your life knowing you're going to die someday and disappear forever.
Ryuk (リューク, Ryūku) is a Shinigami who indirectly gives Light Yagami a Death Note. Ryuk is bored with the Shinigami Realm. In an effort to amuse himself, he steals a second Death Note and drops it into the Human World for someone to find. This Death Note is discovered by Light, who uses it in an attempt to rid the world of evil and injustice, satisfying Ryuk's need for entertainment.
He can be seen during the final battle.