From LSWiki

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

The ability to use the Shan Dareis language, a form of gestural speech or sign
language used by the Far Dareis Mai,or Maidens of the Spear.  Shan Dareis is
a closely guarded secret, especially as Spearmaidens use it heavily for
communication in battle.

Notes

Trainers

Association only: Maidens of the Spear:  Sulin