Undercommon

Much like a Common language can be found in almost every continent, some form of Undercommon can be found beneath almost every land's surface. Whatever land or time, Undercommon acts much the same way as Common does above ground: a unifying base language that serves traders, cross-country businesses, and the lower educated who live beneath the ground.

While most Undercommon spoken and written throughout Talus was begun by the first Drow'dorei, it's efficient and easy linguistic principles allowed it to be adapted by other intelligent - if not highly civilized - races who dwell in the Underdark.

Script
Undercommon script is based on ancient Elvish, but has evolved to incorporate smatterings of Dwarvish as well.