Thieves' Cant

This language is considered the most varied and complex in the world yet scholars and Wizards are not the ones that use or study it, even with more variations and dialects than all the languages in the world combined this is less of a language and more a way of speaking or understanding. This way of speaking can be done using any language, any script, hand motions, or just impromptu pictures that have been scrawled on a table with a knife. In a similar way to the Druidic language, this is not one that can be learned through mere study but rather it is learned through experience by those that have spent their lives on the streets, in the criminal underworld or in the shadows committing actions that few of us would dare to think of.   This language uses common words in whatever language that it is being spoken in, for instance, Thieves' Cant could be used with the Dwarvish language or the Common language or the Celestial language. In order to employ it, the speakers engage in a conversation using common terms and words but mean completely different things that anyone else would disregard as a common conversation or nonsense at most. "Have you been to see the Baker lately?" might instead mean "The Fire Mage is looking to kill you sooner rather than later." A simple picture of a letter that has been cut into a table in the tavern may be a death threat to the next person that sits there or a person that frequently sits at a given table.   No manner of magic or insight will allow someone to understand Thieves' Cant if they are not a Rogue and have not committed their lives to the shadows of the criminal underworld in some way. While someone would hear the words and know how to replicate the same exact picture, the meaning would escape them completely and there is no guarantee that the same words and the same picture will have the same meaning in a different context.