Charon

In Greek mythology Charon was said to be so ugly that he could not be looked upon by human eyes.

He worked with Hades in Hades.

Charon does indeed mean ‘fierce brightness’. He was the ferryman in the underworld that carried the dead across the river Acheron (not known as Nyx. There are Archeron, Styx, Lethe, Cocytus, Phlegethon, but no Nyx. Nyx is a goddess alone) but only if they had a silver coin (obolus) under their tongue. If not, they were cursed to wander the banks of the Acheron for 100 years. For this reason, Greek corpses were buried with a coin in their mouths.

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Charon is the son of Nyx and her brother Erebus, therefore sibling of the Keres, Hemera, Moros and Eros.

Charon ferried the dead with their silver in their mouths. The river was also called the River Nyx - which is another name.