Dragon Slayer Nei is a branch of Lost Nei which allows its users to edit the physiology of their body to emulate those of a dragon.
They can consume external sources of their natural element to replenish their own Chakra. 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 Force is the final stage of Dragon Slayer Nei, though the exact conditions to invoke it are 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.
As the Nei's name implies, the user loads their guns and fire Nei bullets that are highly accurate.
The bullets can vary from normal bullets to any other type of bullets, such as wind bullets, mud bullets, sunlight bullets, Magic bullets, etc.
In ancient times this rare gift was known as Arrow Charging, and regardless of its name it can be used with nearly any kind of projectile weapon.