C1578 The Gods of the Sea Race
The area they controlled was filled with temples of the Tidal God. If they weren't worried that too many people would divide the origin of their faith, the Siren could have several SemiGods ignite their Divine Flames at once.
It was also under this premise that the Sea Deity killed two Tidal Gods. In the end, it discovered that the more it suppressed the other party's rebound