Cygra'al is a horrific being as old as the universe, itself.

 

The creature, which is the size of a small moon, travels through the cosmos, seeking solar systems with planets that have intelligent life.  Cygra'al will position itself between the planet and its star, blocking out any light which will, ultimately, end all life. Only if the creature feels it has been sufficiently worshiped, will it move on.

 

Men who have dared look directly into its eye have gone completely insane.  The Cult of Cygra'al knows better, of course, for they have studied and worshiped the being, in secret, for thousands of years.  Cygra'al "visits" their planet every 80 years and, knowing it is coming, the cult have prepared a gift for their master.

 

Image from Tales of Monsters - Cosmic Abyss.

Cygra'al and its cult.