"Well, dangerous is perhaps strongly worded. Taxing is more accurate. Remember that each spell you cast is turning your will to reality. You impose a force or state upon something not controlled by you. It's the fuel of this process that makes it so dangerous. It uses a wielder's 'life force'. It's also been called 'mana', 'soul', and 'heart'. The more you use, the less time you have. Because I'm a Guardian, the tax is significantly reduced. But as you can see..." He opened his robes to reveal a series of vicious scars that appear to be from a variety of sources. Stab wounds, burns, slashes, void burns, freeze scars, and many others could be seen. "...the more powerful the spell, the more life you lose. Even a Guardian's infinite youth is no match. I have aged much over the years. Much more than I would have without magic" He closed his robes once more and secured them. He turned to look at them with a gaze full of regret and pain. "The costs are far greater on those around you. Everyone that I have ever cared about has perished. Sometimes from my own hand. I've lost over a dozen fireteams throughout the years. Each time I barely avoid death only because someone takes my place" He was silent for a second before speaking again. "When you push your will to reality so many times, you can do it without even thinking. No matter what you truly want. Your nightmares come to life just as much as dreams"