The Web's Weave

The Web makes extensive use of a dialect within its members. It's referred to as the Web's Weave, in reference to both their name, and that mages often speak about the Weave as though it were a language of its own. To those who've never heard of it, or don't know it, it sounds like a normal conversation, though perhaps missing a verb or a noun.
It originated with the Web, and is primarily used by them, though, as the Web expanded, spy networks in "neighboring" cities (Rahn isn't really close to any other city), also began to use adapted forms of the dialect, often switching out specific locations, but keeping sentence structure relatively similar. Someone who understands one branch can understand another, and within the region of Nurr, this slang has been referred to as the notorious thieves' cant. While it is not the same as the thieves' cant recognized as such within Silinac Bay, it does share the main characteristics. Linguists have been arguing over whether or not they should classify the different types of thieves' cant as different languages. While they were developed independently, they share many features.
Within Rahn, and within the Web, it is used fairly generally. Members of the web use it to identify others, and set up meetings. Letters sent between two members of the Web is required to be encoded, and virtually any information that is not directly being sent to a customer will be encoded.

Writing System

Shares the same alphabet as whatever parent language it's bastardizing. No changes are made to letters.

Vocabulary

Typically keeps all vocabulary as the parent language, just used to mean different things, or used in different ways. The Web has, however, made up a number of additional words, specifically words that represent one of the people of power within Rahn. These appear to be similar to words already in the language, but if one had a dictionary, they would find the words don't actually exist.