power of the soul, spirit fushion Options

Iv been wondering and this is just a strectch if there is such an art of mystic ability that allows a normal human to bond his spirit with that of the fiends around him the devils that are in physical form would it be possiable for a person to be able to hold the spirit within themselves and then use it when ever they want with a degree of negetive effect but still im just wondering iv seen it done is some bits of fiction and also have read in some obscure mystice works that it is possiable i would just like to hear from others and if so how to do it would not mind learning myself

I agree that there's really not much point in bonding oneself with a low energy entity as the ones I think that's being referred to. Most 'fiends' are really just energy sucking losers that couldn't cut it by themselves and are looking to get back into the game. Any entity that promises power is pretty much asking you to buy a beachouse in alabama. The knowledge and conversation with your holy guardian angel however is an admirable goal and certainly achieving it will bring a fulfilled life.
I would however like to disagree with the idea of let's get out of the safety area. Now, in spirit I get the meaning. In my heart though I see it as somewhat careless. How many people have gone down the wrong path following the slogan 'c'mon, live a little.' Sure safety might be boring, but at least its dependable. Now of course to dare is a great idea and we should all lead our lives with courage... still I think there's very, very much to be said about being within oneself. In modern ficition you will also notice that the heros often don't leave their world of safety voluntarily, they are thrust into their role in the large majority of cases.