User blog comment:SpookyBoogie27/Light Novel Spoilers/@comment-67.176.158.104-20140207023318/@comment-92.84.96.239-20140207113114

Juggernaut Drive uses the user lifespan but isei is now a dragon and dragons are imortal.They dont have a lifespan like devils they will live forever if they arent killed by someonw.