"Nah, no Sister Ray or WEAPONS." It might be handy if they had either, but they didn't. And both of them would only destroy more of the city even if it did get rid of the thing.

"Turns out Sin's just the armor." Living, breathing armor. "Apparently you kill it by killing the guy inside. Who's apparently some kinda undead. There's a way to get him too, but... we'd be relying on one guy to finish the job - apparently he's the only one that can do it."