Imagine that one of the Lanterns of Sector 2814 gets relocated to another Sector or maybe one of them just left Earth. So, one of the Green Lantern rings select Batman. Most of the other characters worry if Batman is gonna let all that power go to his head and corrupt him but he just sees this as an opportunity to help people a bit more. He goes to Oa, trains with the best, learns everything he can about The Guardian's science and technology, uses meditation and other methods to fully utilize the ring's power to it's fullest potential, studies every single thing he can from the ring's database and learns to use the rings power to create complicated, technological constructs and even manipulate matter and energy. He trains to do all of this for five years. So, how powerful and how effective a Lantern do you think Bruce would be at the end of those five years? Will he be able to take on the likes of Superman and Wonder Woman and Captain Marvel, by using the most powerful weapon in the Universe?