Dragon Slayers

The Dragon Slayers (ドラゴン・スレーアーズ, Doragon Sureazu) are a group of Humans who carries the ability to slay Dragons. This is used in the FanFiction Story, The Twin Dragons written by HolyknightX

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 A Dragon Slayer, are Humans who're given the power to slayer Dragons. To become a Dragon Slayer, a Human would need to make a "contract" with a Dragon, this is done by the Dragon sharing a portion of their own power with them. And if the Human's body fully accepts the Dragon's power, then they'll be able to full make use of it.