Bia the leader of the other 6 sins controls the power of khaos inside him. Using his sin powers he was able to taint 6 other people to gather souls to summon his pride, his god Khaos. His 7 feathers lets him see what the other sins are doing and if they should step out of line he will bend them to his will.

cause of his pride in his god Khaos, the planet eating creature gave Bia the knowledge and power needed to open a rift to Khaos world and cause the end of days. To this day Bia is weak and must recover for the grand summoning of his god. The more souls the other 6 gather the closer Khaos is to coming back into this world.