Fridge Brilliance - After the ending, the Hero (and his bloodline) basically ends up ruling over half of the world anyway.
This only applies to the original Famicom version of Dragon Quest I. You know why the Dragonlord's Superdragon suddenly attacks you after you killed the Big Bad? You just killed its master and it is really angry about his master's death.
I'm very curious as to where this rumor came from. It's refenced in as least three tropes on the main page, and it just isn't the case at all. After defeating the original Famicom Dragonlord ("Ryuuou"), three words appear, meaning "Dragonlord," "true form," and "revealed." Then the dragon appears, with the same "Ryuuou" name. What's up with this?
Fridge Logic - Why the hell would a bard need such an elaborate tomb? Sure, his silver harp summons monsters, but nobody in their right mind would want to use it. Dragon Lord? He's already commanding the monsters. The only thing that would make sense is that it'd sell like crazy. And that's only if the buyer was stupid enough not to know about the legend about a world-famous bard, which is quite unlikely.