Electromagnetic Pulse Apocalypse

As for Mona, she's definitely a 3rd-tier unit, and she doesn't have much to lose, but it allows us to offload a useful role for the city – me. While they're wasting turns and resources on her, the boss can focus on killing.
I wouldn't even be surprised if she's protected. It's a very good move: protect someone and then unleash a maniac or someone else on them to protect the rest.