Faerun is ancient with a multitude of cultures and civilizations that have risen and fallen over time. The historical heritage of these comings and goings is passed down in the customs and languages of the survivors.
Over the ages, different languages have merged into a single language that everyone could understand; nevertheless, ethnic idioms are still widely used.
Wild Jargon
Wild Jargon is a very ancient language, precursor even to the First Language. This was the language of the earthly Satyrs before they split into Beronzin and Rizadrin. Wild Jargon is an oral idiom corresponding to Primordial Runic, a runic alphabet whose characters can represent both phonemes and concepts and images. This language was transmitted by the Golden Satyrs to the Ejre, who still use it.
Language of Stone
The World Below was once densely populated by people who employed the Stone Language. Even today, cultures descending form those people use this idiom. The Rizadrin were the ones who devised the numbering system used by all the people of the World Below.
In the World Below, these numbers were engraved on valuable minerals, acting as a currency for local populations. To date, such finds are difficult to salvage and greatly appeal to collectors.
The numeration worked like this: a central dot indicated 1, and around it there were marked as many dots as the digits that were to be added. From 10 onwards, concentric circles were used to indicate decimals, with dots around them indicating the numbers added (e.g., 2 circles and 3 dots = 23). Concentric circles ended at 10 and represented 100, and from there the additional decimals were indicated with lines starting from the last circle. Finally, when these lines reached 10, they were replaced by bars to indicate the multiples of the hundreds (3 bars around the hundred meant 3 times 100, so 300).
First Language
The first language used by mankind in Faerun. It was created by Anireth and was used over the centuries and throughout Faerun by other human cultures. The First Men still remember it and employ it; despite the advent of the Common Language. From it derives various dialects, among which the Common Language stands out, merged with elements of languages belonging to other ethnic groups.
The Rizadrin also gave the First Language symbols written for numbering, different from those they already employed, and these are used almost by everyone, except by the inhabitants of the underground.
Whisper of the Echoes
This mysterious language is nothing more than the voice of the Echoes of Death and the creatures of the Dark Mirror are able to speak it.
It also seems to include some untranslatable symbols, which are sometimes transcribed by those who want to open a door to the dark world of the Enfaerun. Still, no one has ever been able to attribute meaning to these glyphs, which are called Nightsigns, let alone transcribe them, unless they are inspired by dark beings.