Devised by the most powerful Cuada sorcerors, it is intended to guard their race against the most powerful menance that they have ever faced.
Common for sailors to get lashings for punishment. Sailors would then get tattoos of god symbols on thier back so the thrasher was less likely to whip the symbol of the god.
Others say symbols bring bad luck. They draw the attention of the god and it could be wrathful.