As you may know, the Bolt Blade is level 15+ and worth 1750 crowns. What you may not know is that it's dropped by Prince Aka Karanahn, in the Karanahn Palace. I recently got it on one of my lower levels, and that was quite a plus. If you have a lower level, you may want to farm him a few times. Just letting you all know ;D
EDIT: I forgot to mention it also gives a normal pip at the start of a duel, and does 80 storm damage as its attack.