Hades

Hades is a plane of existence where the souls of the dead go after death.

After the wizard Vedi was killed in 494, her soul was transported to a vast ocean of screaming, howling souls. After some time, her consciousness was brought to what seemed like a vast desert, with billowing sandstorms, where countless souls were heading toward a vast obsidian citadel. According to Lady Hyetta, this was Hades.