The language of Dwarves. Can be learned by purchasing a Dwarven Language Primer from:

• Boomcast at Boomcast's Books in Graystone Yard (Qeynos)
• Martok K'Fauxx in Neriak, City of Hate
• Scribe Hilja Saraste in Kelethin
• Eredykil Zum'tok in Gorowyn