Kuga-Kuma.
There were many ways the Plague was personified in Slavic mythology. An old woman, a young woman. But she was seen as a fairy like creature from the woods who brought justified death when people would become too heavy for the Earth. She wasn’t burdened by morality of the dying just the number. But the situation wasn't always dire, there was a way to save a sick child. When a child gets sick, a fresh new outfit would be made and the child would be presented by one or two women for the Plague to except them as their godchild. If she would do so, she’d be bound by this new role to be a godmother instead, protect and spare and save the child's life.