Gunsmith

Gunsmith is a term used to refer to someone who has fragmented part of their soul within their firearm through transmutation, effectively increasing the power, range and holding capacity of their chosen weapon. Originally concieved and perfected by "The Man in the Black Overcoat", a number of characters throughout the series have embedded part of their souls within their weapons in order to combat more effectively. Fragmenting one's soul also has the side effect of placing the user outside of reality, enabling them to seemingly teleport and, in at least one instance, travel through time, as their soul is no longer anchored to a body, and thus no longer relies on the laws governed by time and space.

Process
Gunsmithing as a trade requires vast knowledge in shop mathematics, ballistics, and chemistry; as well as the capacity to work accurately and precisely. In order to fragment one's soul in order to augment one's powers, a Gunsmith must pour blood from their right hand into their product and allowing their soul to be embedded within the fire arm.