Here's why it's considered supernatural:
* Divine Justice: The story tells of Bishop Hatto, a greedy and cruel man who hoarded grain during a famine and burned alive a group of starving people seeking refuge in his barn. As punishment, he is visited by a horde of rats that devour him and his entire family.
* Rats as Agents of Vengeance: The rats are not just pests, but supernatural entities sent by God or fate to punish Hatto's cruelty. They are depicted as relentless and unstoppable, symbolizing the inevitability of divine justice.
* Symbolic Significance: The story carries symbolic meaning, suggesting the consequences of greed and inhumanity. The rats, representing the anger of the starving masses, serve as a powerful and chilling image of the divine retribution that awaits the wicked.
However, "Bishop Hatto" is not mysterious in the sense of having a complex plot or an unclear resolution. The ballad is straightforward in its narrative and its moral message is clear.
In conclusion:
"Bishop Hatto" is supernatural due to the divine intervention of rats as agents of punishment. It is not considered mysterious, but rather a straightforward tale of retribution.