The Veritas is a fairly unremarkable variant of the Vladof Assassin-pattern handgun, only worth using over a standard weapon for its bonus in Fight For Your Life. It can be beneficial if a character has a spare weapon slot for it, but will quickly be exceeded in capability as the character levels.
The flavor text refers to The Boondock Saints series of movies, joking that they should have stopped producing them after the first, as well as being a direct quote from the first movie. The Veritas (and Aequitas) are named after the tattoos on the main characters' hands.
The words "Veritas" and "Aequitas" can be read on the barrel of the gun.