My favorite part of Final Fantasy V lore has got to be Enuo. This badass sorcerer used his power to create and merge himself with the entity now known as The Void. He gave his soul (as well as his immortality accidentally) to The Void in order for absolute power. Without it, Ex-Death's plan to destroy the world would be a fool's dream. Enuo's backstory also explains the creation of the 12 legendary weapons formed 1,000 years before the events of FFV.