Thief is a Class in Salt and Sanctuary.
Thief is one of five Class that begin with a Shield ( Paladin, Knight, Cleric and Pauper being the the others). Choosing this Class means that you will want to focus your Skill Points on Assassin and Light Armor. You will want to invest points into Dexerity Bolstered to increase the damage of your Weapons and Renewed+Will to increase Willpower, allowing you to gain more maximum stamina, and thereby quicker movements.
Rogue's Set Location:
You are also able to collect the Rogue's armor set from a chest at the Festering Banquet. From the Shrine before the Sodden Knight drop down and exit left (do not drop down the ladder), continue left but jump to the platform above the door. Make your way up the two sets for stairs and jump to the platform above. To the right of a corpse is the Rogue's Set. Note: This is a Level 0 Light Armor set.