Thief Masteries

A simple idea.

Such a thing is often done for Fighters, but I am a lover of Thieves, and therefore ...

The Thief is often considered the weakest of the classes in classic D&D (and retro-clones), especially since it is often possible for any character to perform thiefly actions in the OSR.

But one of the peculiarities of some OSR currents, is that they have embraced an interpretation of Thief abilities that considers them almost magical.

So I came up with a small list of additional special abilities for the Thief that players can pick from to customize their characters.