I'm going to explain a little about a few thing I'm not going to explain in much detail in the story. I hope this all helps little bit.
Dragons:
Black- This guy's main element is darkness. The have variants in the elements like those with a red parent and a black can have a child that can use Dark Fire a fire that uses the one who's on fire's own mana as fuel to keep it going. Black and green can have a child capable of using Poison. Black and blue can have a child that can use Toxic Water. If you see one of these dragons sleeping a cave let it sleep unless you have something of great value to it or have a death wish.
Gray – They control the winds they tend to have the largest wings of all dragons and some have a feathery appearance it is best advice to not get on a Gray dragons bad side as they can kill you with the very air you breath.
Blue – They control the waters and it's told that an ancient blue dragon can control your very blood if it wished.
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Red – They control fire and some can control magma but those are far in between as dragons rarely mate unless it has a Draconian mate.
Green – They can control the earth and a rare few have powers over nature as well. These dragons if they have the power of nature is best to try to get into the good graces as in a time of famine they can help stop it and even renew the lands.
Silver - Not much is known about the silvers other than they are the royal line with the blood of their goddess in their blood. Some are even to say have to power of the divine and with it all elements even life itself but as to know if this legend is true we might never know as most silvers are either dead or in hiding.
A/N: Tell me if you want to know more about a creature or a race in the story as I will update this for things I think you might want to know.