From LSWiki

Class: Language Skills
Attribute: Intellect
Pedagogy: Procedural
Practitioner Term: Speaker of Klargth
Hidden Skill
Language Sound: Brutal
Language Difficulty: Slightly Hard
Language Speed: Slightly Fast
The ability to speak and comprehend Klargth, the language of bezhuldaars.
Development Information: The Klargth skill was created by Chaos and is maintained by Lost Souls; the source code was last updated Sat
Jul 26 15:42:21 2014.

Trainers

Northlands: Farouzh wanders (only train bez) 
Associations
Crafty Linguists: Janid Suzak Wanders