Percy Jackson and the Olympians: Legends

Styx had ebony hair that was wafting in the cold current. Her face appeared delicate and sublime. Her obsidian eyes gleamed with absolute hatred. Styx's purple and black dress billowed around her like volcanic smoke. Her lipstick, eye shadow, and mascara were all expertly done in shades of midnight.

Styx is solemn and severe. She’s not one for frivolities. Her role as the ultimate oath-keeper among gods and mortals alike gives her a stern demeanor. She’s revered and feared, a goddess you wouldn’t want to cross—literally and metaphorically.

Styx is one of the Oceanids, the eldest daughter of Oceanus and Tethys, and presides over the River Styx in the Underworld. During the First Titanomachy when Zeus was gathering allies, Styx and her children journeyed to Mount Olympus, whereupon she swore her allegiance to him. She was the first to do so and, in gratitude, Zeus bestowed high honors upon Styx. He decreed that the name of her river would be the one by which the gods took their solemn oaths, and that her children would live with him on Olympus.