The Maruvians grew jealous of the Cremorran snake-based economy, as their own economy depended on mice, so they went to war on Cremorrah. However Maru had no armies so they used dark magic to create a potion that would turn the entire city to stone. Wiping them out in one blow. It is later turned out that the source of their dark magic came from Maru's bargain with Hell.
The Royal Family seems to suffer a curse of madness and paranoia that runs deep in the family. Jerry explained to Bean that some past family members murder their parents, tried to drown their grandchildren while one married a duck.
- Maru is based on ancient Mesopotamia and ancient Middle East.
- The hereditary madness that runs in the Maruvian Royal Family is based on Targaryen madness of House Targaryen from Game of Thrones.
- The city of Maru also has very similar design to Meereen, the greatest city of Slaver's Bay in Game of Thrones.