The language of the Kobolds and Bugbears within the Echoes of Faydwer. Can be learned by doing the quest Language of the Dust from Lingualogian Roosey at the Gnomeland Security Headquarters in Steamfont Mountains.

Ratonga can learn the language simply by talking to Lingualogian Roosey.

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

• A Couple Ringlets Missing
• Ritsy's Lucky String
• The Staff of the Observers
• The_Stormhammer_(Quest)
• The Bellywhumper Harvest (74 repeatable)