Water Dragon Slayer Magic (QOS)

Water Dragon Slayer Magic (水の滅竜魔法, Mizu no Metsuryū Mahou) is a Caster, Lost, and Dragon Slayer Magic which utilizes the element of metal to potentially kill dragons.

Overview
As the name suggests, Water Dragon Slayer Magic gives the user dominance over the element of water. They are capable of manipulating water, controlling water, and absorbing water much like a Water Dragon would. To gain this form of magic a practitioner must either have gained the changed physiology of a dragon —such as a dragon's lungs, scales, and stomach— through training with an actual dragon, learning it artificially through the use of a Lacrima or a combination of the two.

Trivia

 * This is the author's personal take on the popular water variant of Dragon Slayer Magic, if you would like to use it, you may ask.