[tessierashpool]

Greek letters were used as numbers during the time of the Romans.

https://en.wikipedia.org/wiki/Greek_numerals

also, sorry to be that guy, but D&D hasn't had a thief class since 3rd edition came out, in 2000.

[dukeyukey]

To be fair there's a Thief subclass

[yetanotherloser]

re: being That Guy: I know. It's a weak "Romans were old school" joke.

[yetanotherloser]

ps good shout on the letters, which I had thoroughly forgotten. The d20s still are odd though.