The language of the Sathirian Iksar within the RoK. Can be learned by doing the quest Feathers for Sethis, which is in a series started by the collection A Mysterious Black Tome.

The ability to speak Sathirian is needed for the following quests:

• More Territory, More Problems
• The Saga of Yasva V'Alear
• The Broken Hand
• The Heart of Treachery
• They Have Searched an Age for a Dark Champion...