The Twin Serpents

The Twin Serpents Knadls and Sadilyss are important figures of Aruan and Etherian folklore. They act as the Gatekeepers of Lyeth, a spiritual realm outside of the mortal plane that is commonly referred to as the underworld or Hell.

Origin
While their exact date of creation is unknown, they are believed to have been made by Verdana to prevent the Caster of the Darkness Casper from escaping Lyeth once he was killed. With this event never occurring, they instead were put to use to make sure no deceased entity escaped and no living mortals tried to enter.

Description
Knadls and Sadilyss are often described as being intertwined around one another, though they are able to separate themselves with ease. Both are unkillable, but they can be wounded with their own scales.

Knadls has scales of gold with two black holes that look like eyes, but are actually openings into its body. As such, Knadls is completely blind, relying on vibrations to seek out others. Meanwhile, Sadilyss has smaller, holographic scales and two eyes. It is considered to be the more docile of the two, and is seen as easier to defeat.

Depiction in Arts and Literature
The first known appearance of Knadls and Sadilyss was in the Etherian myth of Zora, in which the titular character Zora falls down a giant ravine and ends up outside of Lyeth. Knowing that Zora is still alive, Knadls and Sadilyss lead them through the ravine to a staircase back to Lydian. This myth is one of the few instances in which the Twin Serpents were not adversaries to the protagonist. In most other stories that they are involved in, they prevent the hero(es) from exiting Lyeth and, being unkillable, are only defeated through trickery.

They are also symbolic of sin and virtue, with Knadls being representative of sin (specifically greed) and Sadilyss of virtue. These symbols largely are inspired by the Inotian novel Of the Abyss, in which the protagonist dreams of stealing the golden scales of Knadls while it is sleeping and revealing the unspeakable horrors contained beneath them. In mythology the Karim god of justice Thaluza is decribed as having a staff with two snakes coiled around it as a reference to them.