Weisslogia

バイスロギア

Weisslogia was a Dragon known as The White Dragon, and the foster father of Sting Eucliffe. He taught Sting how to use the Magic once fabled to be able to kill Dragons themselves: Dragon Slayer Magic. White Dragon Slayer Magic gave Sting the characteristics of Weisslogia himself. [Spoiler] However, Weisslogia instructed Sting to kill him and bathe in his blood so that he could become a "true" Dragon Slayer. [/Spoiler] (Source: Fairy Tail Wiki)