You would only be called ruler of the underworld because you happen to hate daylight and you prefer to burden yourself in the black mud of dark caves at river mouths. That happened to the Hadeszangmurene, a new species for science that biologists discovered in a Filipino cave with an underground river near Puerto Princessa.
The Taiwanese biologists of the Sun Yat-Sen University were looking for a different kind of wall (Uropterygius Cyamommatus), also a new species that they discovered in 2010 and described for the first time in 2023. This has degenerate eyes, an indication that the species has adapted to life in caves in the course of its evolution.
But instead of that cave wall, they found a new species to their surprise! And this was the first mud crawler among the walls. The animal immediately reminded the expedition leader Wen-Chien Huang of the Hades coming from a black dust cloud in the film Clash of the Titans.
In addition to the Philippines, there are now also reports of Hadeszlangmurenes from Japan, Taiwan, Indonesia and the Fiji Islands, where previously collected walls and turned out to be among the new species. There are more than 200 different types of walls worldwide, most of which live in the sea.