[Ghostcat]

The 'thief' class in UL is sort of like you recommended.

There isn't an actual thief class, and the usual thiefly skills are rolled into one of four subclasses that physical fighters get. They aren't as good at many of the normal physical skills, in return for better stealth, larceny, and the ability to make and apply venoms to weapons.

The PvE and roleplay focus of the game is worth noting too. While you can steal coin and a few kinds of loot from PCs, it's discouraged In-Character with jail terms and fines if the thief is caught. You can always attempt to play a thief and agree out of character to pretend something was stolen though, and that can make for some fun RP without things getting out of hand.

I guess it's important to note that anyone can use the larceny skill to take the few categories of steal-able things, and the backstab equivalent isn't overpowered. The only advantage the 'thief' class gets is a higher skill cap/level and a way to easily train it on mobs.

Oh, and there's no super-secret thief club. A fight club, on the other hand...