Morkus from Orkus
So the only difference between them and every other non-magical class is that they speak the secret language.Magic is an option. Not a base of the class.
And I already explained the concept: the adventuring scholar or aristocrat.
A major problem with D&D is that the non-magical experts are all thieving, backstabbing murderhobos who know the secret language of the Thieves Guild.
I want to play Lord Green: a highly educated man know knows a little bit of fencing.
I mean, I sometimes have my fighters steal things, stab people in the back and be murderhobos.