TYB
So, Hades is also Pluto.
Pluto (Latin: Plūtō; Greek: Πλούτων, Ploútōn) was the ruler of the underworld in classical mythology. The earlier name for the god was Hades, which became more common as the name of the underworld itself.
https://en.wikipedia.org/wiki/Pluto_(mythology)
The description another anon gave up there said they are the cult of Hades, or oversee the cult of Hades.
So maybe they are connected to Pluto?