I Was Exiled to Die, Now I'm the God of Sickness and Salvation

Even as an orphan, Ash had it all.Top of his academy. Admired by men and women. Sponsors lined up to claim him.Until his affinity test revealed him to be A null. Affinity-less. Magicless.He was thrown out like garbage. Exiled like a plague-bearer.Abandoned in a mutant-infested wasteland, Ash was meant to die quietly. Forgotten, like a torn scrap of paper.Instead, he found something.A sickness that loved him. A god that claimed him. A forest that remade him.He walked out of the wasteland with a new faith.And now, he's here to heal the world.One infection at a time.=============================TLDR :1. Surviving sickness/poison/venom/curse = awaken power.2. Poison A + Venom B = New disease! = New power!3. MC is a cult leader!? He can 'bless' his followers with diseases!?4. Wasteland is not ordinary wasteland!? It's actually Earth's *** !? Gain more power related to bio*** !!?!