Hussar
Legend
As a DM, if you include monsters that don’t speak common (because seriously why would they?) and ruins are covered in ancient text, your players will be incentivized to learn additional languages.
Conversely, if one or more of your players takes the Linguist feat, you are incentivized to include situations where it pays off.
Absolutely. Totally agree.
But Thieves Cant certainly won’t feature in ancient ruins. And virtually nothing speaks Druidic.
I’m not arguing against languages. That’s fine. I’m pointing to the fact that thieves can’t and Druidic specifically have never featured in any gaming material I’ve ever heard of. Certainly never seen it used.
Hell Fantasy Grounds doesn’t even recognize either as a language. That’s how little used it is.