Slayer Andras

Andras is a merciless slayer who equally gifts death to all those who don't worship her. She was one of the 4 Demon Gods who reigned over Demon World, but lost her body after being defeated by Lilith and Erina in the past. However, Andras's soul didn't perish. She possessed bodies of Demons of her bloodline and started to recover her strength. Andras possessing Celine took place because of an abnormal worshiping organization. This organization formed during the Demon World's reunification war. They kidnapped orphans from war and extracted their high purity mana by sacrificing them as offerings. Their goal was to accumulate the mana to reincarnate the Demon God and use her to win the war. The organization's leader finally succeeded in bringing back the Demon God after offering thousands of children. However, Andras didn't show mercy towards the organization that dared to use her for their own means. She wiped them all out on the spot.