When faries fight

Its all happy happy happy in the world of fairies. They are happy to share the world with humans but humans can not see the fairies. When a drug is invented that lets fairies be seen by humans many do not agree with selling the drug. But when the drug becomes more expensive then money and fairies have to practically give blood to get some, it becomes the image of power and all the fairies are prepared to die to get some. When war breaks out in fairy land, fairies result to killing and they don't mind what. They would even kill a human, if it got them some.