From publisher blurb:
"You were once a petty thief, but you have been irrevocably changed by a being from the eldritch worlds beyond your own. Perhaps you stole an ancient artifact infused with the essence of an old god, or incurred a debt with the warlock of a terrible, inconceivable being—or, most frightening of all, visited the domain of a strange and esoteric entity, drawing the attention of its uncanny eyes.
Regardless of how you came across your power, it has given you a bizarre edge over your competition, allowing you to steal and fight like no mortal should."
The Far Thief is a standalone subclass for rogues in 5th edition, allowing players to leverage strange artifacts against their foes and step into the corridors between worlds, stealing and causing mischief like never before.