Y'chak

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Y'chak, also called The Violet Flame, was an elder evil. Alone among them, it was actively interested in the development of life, or rather, in the development of the destruction of life.

Description
When Y'chak wished to contact someone, it appeared as a respectable or seductive member of the same species. Its true form, however, was said to be a pillar of brilliant violet flames that concealed a core that was too horrifying to see lest the viewer be completely destroyed in mind, body, and soul.

Personality
Y'chak was only known in the Material plane as being actively interested in causing destruction and ruination.

Activities
Y'chak's presence could be seen in civilizations throughout history, as it acted as a muse and inspiration for anything destructive. Y'chak was also known to encourage the worship of deities of cruelty, war, or death; the aboleths believed that such deities came to be due to Y'chak's quiet whispers.

Worshipers
While aboleths did not worship deities or other entities, they did respect and admire certain elder evils, of which Y'chak was one. To honor Y'chak, the aboleths built massive pillars of violet flame in their cities. These burned underwater and their writhing and pulsing motions could be used to mark the passage of time or send crude messages across the city.