First off, what do you think of the name of the race? It was a random thing that popped into my head as this idea was forming.
I wrote this really late last night, so I probably forgot some things. Feel free to ask questions!

It's a partial scene; one of the Dra'can is speaking.
(ignore the fact that this is probably poorly written

I just had to write it down before I forgot it)
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“We aren’t vampires. You’d better accept that right now. We don’t eat blood, we simply need it to survive. Just like you humans. We have this condition… blood somehow disappears from our veins, and when injured we bleed profusely. If we manage to keep from getting hurt, which is harder for us than you humans because our skin is thinner, we can go about a month without having to add more blood to our systems. The thing is, we do have to get that blood somewhere. That’s where you humans come in. We’ll find someone to be a donor of sorts. After a month we’re pretty weak, and need every drop we can get from a person. And the blood has to be fresh… no scavenging after battles. The human mustn’t die before their blood is ours.
Humans cannot become one of us. They die after their blood is gone, of course. And it’s impossible for a human to mate with a Dra’can. We have enough troubles reproducing of our own kind. Half-breeds do not exist. It’s not a disease you humans can catch. It can’t be spread. It’s just the way we are.
I found a very kind man once. I would have taken him for my mate if it were possible. He willingly gave up his blood, once a week. It seems that if we add the blood more often, we need less of it. He barely stayed alive, but he kept me alive as well. Alas, I was wounded very badly one day, and he gave his life to save me.
That’s why you’re here, my friend. I don’t enjoy killing innocent people, but it must be done. There’s no other way for my kind to live.
And really, when you think about it, we’re no different from you.” She smiled coldly. “You humans do whatever it takes to live. No regard for others. This is simply a physical manifestation of that, when you think about it. The will to live drives all of us. I must say, though… this is a need for us. You humans and your selfish desires almost make me not care that you must die for us.”