The Unspeakable One

Haster "the Unspeakable One" is a Cthulhu mythos Great Old One. Although the being is most famously associated with H. P. Lovecraft, it is only mentioned by name. Since deity in Lovecraftian lore tend to have a lot of avatar, so Hastur have many alias since no one seem to dare say it real name. Some of them is "The King in Yellow", "Lord of Interstellar Spaces", "Feaster from Afar" or just "The Unspeakable One" There are a cult and follower of Hastur that revered it as their god, "The Brotherhood of the Yellow Sign" An evil cult who bore the Yellow Sign as their very own emblem, and use it as central core of their ideology. They are one of the many antagonistic groups featured in the Cthulhu Mythos. These people worship Hastur in it aspect as the King in Yellow. It real appearance is mystery since it have many form and can shapeshifting to anyone or anything. And no survivor from it encounter, no one live to tell the tale...