For fun, I've been creating the grammar and vocabulary for the slith language. Most of this information is highly non-canonical, and indeed, the only real source I've used in the games has been the apparent sound system in the names of the sliths.
The primary language that I describe here is Classical Slith, a language spoken centuries past in the homeland of the sliths. It bears only slight relation to the language actually found in Avernum.
Bear in mind that all of this is also highly UNDER CONSTRUCTION. The following pages are both incomplete and subject to change as I continue to work over the next few months.