As you have noticed, in this world we have magic. This magic is not something mystic or unknown in here. We know how it works, and we can control it... most times.
There's energy in this world, that's similar to the substance spirits are made from. It's not physically here, in the sense it can't be measured or detected by technological means, but we can tell our spirits to use it, give it shape, and make it react with the physical things.
In that sense, the spirit is also part of this magic, with the exception of our souls. The soul is something that binds our spirit with our body, it makes us one, and it makes us alive.
Our magic is of many colors, like a rainbow. Actually, the spirit energy doesn't have colors, but our mind needs colors to understand images so, what we call the 'spiritual eye', makes us see colors.
The color of the spirit says a lot about the kind of energies the person can control, and the intensity of this color tells you how powerful that person is.
Red spirits are better at handling fire, electricity and other similar energies. Green spirits are better at changing the substances things are made of.. I think you call that alchemy, in your world. And last, Blue spirits, are better at playing with the space and time, like summoning and teleportation.
Just like colors, spirits aren't always of a pure color, most people have spirits of mixed color. There's also some special combinations that, for some unknown reason, give special effects, like Silver spirits are extremely good at healing wounds and diseases.
You will have noticed my spirit is mostly blue. That's the reason I could send my spirit to your world, and guide you here. I don't know what color your spirit is, because in your world there's no magic energy, so the spirits don't have anything to get the color from.
You have your eye closed now, because you still can't control it, but even if you could, it's hard to see someone's spirit when it's inside its body, because the spirit blends with it. But when the person uses his spirit to do magic, the energy flowing through the spirit will produce an 'aura' around the body, and that aura can indeed be seen.
When my father comes back and teaches you more, you will learn how the first sign of someone using magic will be a flash in your spirit eye, and he will teach you to have that eye open, even when you are asleep.
For now, let's go upstairs, and sleep. I have some things to do tomorrow and your help will be handy.
Oh and, you'll sleep in my brother's room.
Having said that, Ly smiled at Leo and they walked upstairs, each one to his room.