I know you are wanting to go big with this DED, but what I've found from trying to develop big plots is that it is sometimes best to start at the end. What do you want the outcome of this story to be? Are you looking to have Pendezez recognized for his achievements? Want him to drift off as the honorable unsung hero? Do you want him to die? What is the your our personal goal for your characters? It's a good of place as any to start building from.