Executioner

A man, his head shrouded in a hood, holding a greatsword in his torn and bloodied arms advances, he attacks, feints through the swiping claws of the beast and slams the pommel of his sword against its head, the beast reels, stunned, as the man moves to attack again.
A Dwarf hefts her axe with ease, plodding slowly to the prone form of the Crowned Vanguard; she lifts her axe and brings it down with a resounding clang. A warrior clad in blue armor, weilding an Odachi of immense size; strikes with the accuracy and strength of lightning. Decimating the demon before him with a single powerful blow.
Executioners are Sanctioned Killers; they carry the burden and power of the law upon their shoulders, they hold not only the ability to lay enemies low in a single blow; but also the right to do it within the confines of what is right. An Executioner, when on the field of battle, is the Judge, is the Jury, and is the Axe and Chopping block.
An Executioner gains their skill through years of training, even the most instinctual of the disciplines an Executioner may follow is the result of grueling drills and hours of memorization of law and code. An Executioner is expected to function as the just arm of the law, extending forth and striking down all those who oppose it, and many carry out this function with fervance and honor.
An Executioner seeks to make right things that have been wronged, most often through punishing those responsible with the only permanant solution; Death. Most often, Executioners begin adventuring to complete a goal. To hunt down and kill a criminal of some high magnetude, they are dispatched as agents of the law. Some decide to take the law into their own hands, and become terrifying vigilantes, around every corner; and waiting for the opportune moment to strike.
Executioners more often than not balance thier entire life around their purpose, to uphold the law. They train for years and memorize thousands of laws in order to become the single most effective instrument of justice they can possibly be.