Dragon Slayer Magic

Dragon Slayer Magic (滅竜魔法 Metsuryū Mahō) is a form of Lost Magic.

Description
Dragon Slayer Magic (滅竜魔法 Metsuryū Mahō) is a branch of Lost Magic which allows its users to transform the physiology of their body into those of a dragon. As a result of this, those with Dragon Slayer abilities are able to change their body to their own element, in both offensive and defensive styles. They can also consume external sources of their natural element to replenish their own energy. They are also naturally immune to the effects of their own element that came from both their own person and to those from other sources, but must consume it through their mouths if they are to actually absorb it into their bodies. Dragon Slayers also have a heightened sense of smell too.

Dragon Force is the final stage of Dragon Slayer Magic, though the exact conditions to invoke it is unknown. When Dragon Force is achieved, the Dragon Slayer's skin becomes scaly, similar to a dragon, and strength, speed, and magical abilities are enhanced, improving their combat capability significantly. Natsu Dragneel has achieved this at least twice; once after eating Aetherion-infused Lacrima and again after consuming Jellal's Golden Flame of Rebuke.

There are two ways two learn Dragon Slayer Magic, the "Old-Style" Dragon Slayers learn from Dragons and "New-Generation" Dragon Slayers implant Lacrima crystals into themselves. Dragon Slayer Magic has limitless functions in Edolas, and is valued as a priceless resource for everyday uses.

Old-Style Dragon Slayer Magic
Dragon Slayer Magic used by those who have been raised by a Dragon and been taught their abilities.

New-Generation (Artificial)
Dragon Slayers Magic used by those who have Dragon Lacrima implanted into their bodies.