A couple new skills/languages
What do you think about a couple skills along the lines of thieves cant...or maybe they're just languages.
One would be Battle Tongue. Not really a spoken language, but hand signals, etc. The kind of things navy seals, rangers, etc use to communicate silently/during combat.
The second one would be Signaling for sailing. All the flags and arm gestures that are used to communicate between ships at sea and when coming into port, etc. e.g. the lighthouse flashing the light that way means "the plague".
