Sting is a White Dragon Slayer and a Mage of the currently strongest Guild in Fiore, the Sabertooth.  He was raised by the Dragon Weisslogia, who taught him White Dragon Slayer Magic. He eventually used this Magic to kill Weisslogia, in order to become a "real" Dragon Slayer. At some point in his life, Sting also implanted Dragon Lacrima into his body, thereby making him a Third Generation Dragon Slayer.   

||His Exceed partner, Lector, once bragged to people that Sting killed his own parent, but was bullied for it, causing him to cry. Not wanting him to cry anymore, Sting promised Lector that he would challenge a man known as the Salamander, whom he was a fan of at the time, and defeat him; that way, Lector's words would not be taken as lies.|| 

(Source: Fairy Tail Wiki) 

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