I wasn't very happy with my previous story idea. I didn't like the lead in and didn't know how to resolve it. I would have had to model and rig two different characters and that seemed an impossible task by myself. Therefore I changed my "wrapper" story and kept the Pandora's box core.
The hero is a slightly dull town yokel who is fishing at the start of the animation. He is starting to nod off when he gets something on his line. After a bit of a struggle he gets pulls a small evil looking box out of the water. He opens it and black smoke spills out in tendrils. Everywhere the tendrils land a shadow monster appears. Once assembled, the shadowy figures rally and go about the town, breaking things, setting buildings on fire and generally causing great mayhem. There will be a birds eye view of the town incorporating a massive simulation of the shadow monsters running through the streets and breaking things. Fire will sprout up on the buildings in the far shots. The hero is stunned by what he has caused and subtly kicks the box into the water and returns to his pier to fish wincing every time he hears an explosion or crashing sounds. The final shot is the hero sitting down in the position that he started in except in the background the town is on fire. Once he sits down a piece of debris falls from a "fishing" sign that he had been sitting next to the whole time only to reveal that the sign had said "NO fishing."
The advantage of the new story, aside from an improved story, is that I will be repurposing the Carver rig and model. I will remove his glasses give him a hat and some other props and modify the texture but the weight painting will remain the same.
I am happy with this story and have no plans to significantly change it.