Greetings mortals, exemplars, planars, and primes alike. Some of you may remember me from ages ago. I am Center of All, aurumach and former haunt of this place. Maintaining the balance is a busy task, and that task took me away from this place for some time. Now, the equilibrium holds more steadily and allows me to return for a while.
I have recently begun work on a project that, in true Planescape form, deals with identity, nature, belief, and the forces that shape these things. This project requires me to research ideas, concepts, and beliefs from those around me. And so, for the sake of my project, which will be revealed in due course, I pose this question to you all. When I am satisfied or when I feel the time has arrived, I will give another question to you.
What can cause a fiend to rise?
Fiends are thoroughly evil, wicked beings. Baatezu tyrants, yugoloth manipulators, and tanar'ri beguilers, all of these revel in their evil, delight in causing pain and suffering. Many view their upper planar counterparts with disdain, seeing them as weak because of their morals. Why, then, would a fiend, a creature of such thorough evil want to rise above it and emulate the archons, guardinals, and celestials? What would cause him to alter the core of his being in such a profound way? And furthermore, should or would a fiend risen in such a way lose his natural powers? Many fiends possess innate magic that most mortals must study diligently to acquire. Are these granted to fiends because they are evil, or because they simply are?
I look forward to what you believe the answer is.
You answer your own question, my good Aurumach. Belief.
Let me offer you an example. A Fiend, in some eternal, malicious scheme, commits an act that can be percieved as good by a number of people. Perhaps this Fiend stops a rampaging dragon, knowing that one of the people who the dragon would kill would become a horrid tyrant and warlord, who would cause more suffering, and more importantly, condemn more souls to the Lower Realms than a cleansing gout of dragonfire ever could.
But the Fiend does it by slaying the dragon in an aerial combat above a great city. This will cause a very large number of people to believe that Fiend to be good (perhaps the Fiend was somehow disguised that they do not assume the sinister truth). And this belief has a force. Now... a few years down the line, this tyrant comes to power, but the Fiend dislikes him. Mayhaps he is too chaotic, or too lawful. So the fiend will overthrow him, and in the process, cause more people to believe him to be good.
This continues. In time, the Fiend will *become* good. Perhaps his fellows will see his action in a (better) light and eject him on their own. Perhaps he realizes what is happening and exits on his own initiative. Perhaps the Fiend sees the people of the great city as too useful to be used as mere dupes, and slowly transforms into a guardian spirit.
It is Belief that can change. Other's belief, or perhaps the Fiend's own belief. But it is Belief.