A simple act will spawn a monster

Y/n wasn't smart... he wasn't brave, or strong, or even particularly talented at all. He was just a guy with a kind heart. That kindness lead to his seeming demise. Now team RWBY and the remains of team JNPR race to Atlas by train to deliver the relic to safety. Little do they know that the girls darkest secret is about to rear its head and begin its own crusade of justice against them.