I Am a Miracle Doctor in a Fantasy World

The world is dying. A disaster called "ash rot" spreads from the depths of the earth. The forest turned into stone statues, the giant beasts became living corpses, and all living beings waited in silent despair for the end when all things would return to ashes. The glory of the knight was corrupted, and the holy light of the priest was dimmed. Until Linn, a soul from another world, appeared in front of the dying girl's bed. He doesn't know magic, he doesn't know how to pray, and he only has potions and utensils in his hands that mortals can't understand. He is the first mortal who dares to declare war on "Gray Rot", and he is also the only doctor in this world abandoned by God. When he lit the first alcohol lamp, the faint flame became the first ray of dawn to illuminate this era of ashes. The medical clinic he built became the last Noah's Ark for all living creatures in the apocalypse.