(02-01-2015, 07:14 PM)Chicken Nugger Wrote: -Does being black mage make one more powerful?
In the sense that a Black Mage's spell potential is no longer limited by their own aether, yes. Could you technically bring down a star as a Thaumaturge? Maybe, but the strain would likely kill the caster. Same thing with Flare or any of the ancient magicks like Quake or Freeze. Most people just don't have enough Aether in their bodies to fuel these kinds of spells.
(02-01-2015, 07:14 PM)Chicken Nugger Wrote: -Does it also warp one's mind/perception/personality?
Not necessarily. The Beastmen Black Mages we meet all seem quite sane and stable. Though a lust for power does tend to attract adept Magi to the Black Arts.
(02-01-2015, 07:14 PM)Chicken Nugger Wrote: -Will there be voices in one's head?
Nope, not unless your character has schizophrenia or something? Black Magic is very simply just a technique.
(02-01-2015, 07:14 PM)Chicken Nugger Wrote: -Is there any difference between a Thauma and BLM ability?
The only difference is that Thaumaturgy will drain the caster of their energy, while casting Black Magic will have a perceptible affect on the immediate environment. The spells are the same, just some spells are not humanly attainable without using the Black Magic technique. Most people just don't have the aetherial fortitude for it. So would a layman be able to tell the difference between a gifted Thaumaturge and a Black Mage? Probably not. Some might not even know Black Magic is a thing. But if you are discovered dabbling in the art, it is a serious crime, because the art literally damages the planet.
(02-01-2015, 07:14 PM)Chicken Nugger Wrote: -Say someone took a black mage soul stone quite unintentionally, does the stone have resonate just like the Job questlines assuming one is compatible are there any other tells that one graduated from thaumaturgy to black magery?
So one of the annoying parts of FFXIV's gameplay is that, in order to save your character the arduous task of actually studying/learning/practicing any of our talents, you just magically learn things every so often. (This is particularly true of the Mage storylines.) All of the Black Mage NPCs in game make it quite clear that Black Magic is not something that's just magically inherited, but is painstakingly studied and an intense amount of dedication is put into learning the art. So I would say no, just because you obtain a soulstone you should not be able to just instantly be super powerful magi with unlimited cosmic powers - I mean... unless you're friends with Robin Williams?