He really is a slave driver, but I manage to surprise him with how much my strength increased. I can now make it through a full set of his exercises without feeling tired. I am starting to feel a lot more confident about this plan that I came up with.
Originally I just wanted to do something to delay the demon lords, now I am thinking it might actually work. If I can actually help bring down both Lord Shendaw and Lord Dra, then that will be two less demon lords. Not to mention they are the two most powerful demon lords, their deaths will be a big achievement.
With the two strongest lords dead, and the armies of the other five severely damaged, it should buy us years. Originally I was just going to use this as a chance to escape, now I think I should go through with it and do as much damage as possible. Besides, who knows what interesting things I might be able to pick up in the sacking of a demon lord's castle.