"How can I tell?" She looked a little confused at the question, frowning slightly. She paused again, trying to put her thoughts into words. "Magic has a driving force behind it like everything else," she said, hands up. "Swords and daggers have hands behind them that move them from one place to another, and arrows are shot from the taut bowstring. I suppose magic is unusual in that its driving force is itself. It could be considered an example of a circle, because there is no start and no end, I don't think." Arwen stopped again, looking into the fire. Her mood had dropped considerably. "Magic has an aura, I suppose. Not everyone can feel it, but those who are tuned to it can. Most people who aren't magically inclined are tipped off by the glow in weapons."
Scooting over toward Thessaly, Arwen brought her bow over and set it on the ground between them, fingers tracing the faintly glowing veins along its limbs. As she dragged her fingers over them, they grew brighter and duller.
"Armor doesn't have the same glow, really. Enchanted items that cause a visual, physical effect are obvious, but those that work passively don't." She looked around, as if trying to find something to illustrate her point, but came up with nothing. "I'm more inclined to magic than many others, so I can feel it in my fingers when there's magic in something. These lights, the bowls of fire we keep seeing that are lighting the halls here after decades of being left alone, they're fueled by magic. Fire salts and spells, if I had to guess. When you reach up, you can feel it. To me, it feels like...disembodied warmth, like running your hand over the surface of a freshly used grindstone. It may be different for others." She brought her hands to her collarbone, patting her chest.
"My magic feels like it comes from here," she said, bringing her hands together on her breastbone. "And when it's coming from me, it feels like...I'm not sure how to explain that one, actually. It feels natural, though. It feels like it's a part of my soul, and I suppose that's the best way to explain the force behind magic. Maybe magic is fueled by our own souls. Magic is used to capture souls, and souls are used to create magic, so it's an odd circle." Hands finally coming down to rest in her lap, Arwen's expression returned to focus on Thessaly, having gone blank for a moment. "If you limit yourself and if you believe that you'll never amount to any greater power, you absolutely won't," she said, looking more serious than she ever had. "You have to open up to the possibility that you can do better, or you stagnate and will never get to know the power inside yourself. It's how I have fun, anyway. I know I can press my luck time after time, and it's live or die, so I might as well see what I can do before I come to a screeching halt."