From LSWiki

The Etzmarak Language

Class: Language Skills
Attribute: Intellect
Pedagogy: Procedural
Hidden Skill
Gestural Language
Hands Required: One
Optimal Number of Hands: Two
Language Difficulty: Hard
Language Speed: Slightly Fast

The ability to use the Etzmarak language, a form of gestural speech or sign language
used by the drow of Zadnothruin.  The sets of gestures involved are difficult
to master, but their speed of expression makes Etzmarak suitable for use in battle.

Trainers

Yathryn: Kajax (worship requirement)
yathryn: Miss Chalosia
Association:
Crafty Linguists: Janid Suzak Wanders
Guild:
Quest: