Kaos

Kaos, also known as Hell in come cultures, was the dark sect of the Netherworld of the Force where followers and users of the dark side went when their physical bodies died. It was ruled by a Dark Underlord that commanded an army of undead army known as the Countless that tortured the dead dark side users that were imprisoned there.

Darth Zhen, a Dark Lord of the Sith Empire, told his apprentice, Vycerant, mythologies about Kaos and how it is represented in different cultures.

Appearances
Bright Shadow
 * Chapter 2 (first mentioned)
 * Chapter 12 (mentioned only)