Fallout 76 mutations

Plague walker is a condition in Fallout 76.

When the player character, without proper protection walks into a zone, devastated by a nuke that the player character's party launched, they start to mutate, with a dangerous mix of radiation and disease. Within seconds, they become plague walkers.

RadAway cures such mutations, while any radiation protection gear (e.g. hazmat suit or gas mask) prevents such side effects from occurring.