From LSWiki

Class: Close Combat Weapon Skills
Attribute: Dexterity
Pedagogy: Physical Training

The ability to use all manner of daggers and knives in combat.  When using 
such a weapon, this skill influences your ability to hit your opponent, the 
damage you inflict, how fast your attacks are, and how well you use your 
dagger defensively.

Notes

Trainers

Avalon: Bercilak
Devonshire: Thalask
fort Shantaari: Trambor
Kolond: Duthien (only trains dwarves)
Losthaven: The Grey Mouser
Losthaven: Raelan Jax
Skarlan: Badlokk
Mycenae: Kyros
Nexus: Goth
Shakari: Tavar
Shatterspire: Sthlar
Stillwater: Captain Roberts
Valathyr: Mitandim
Xi Feng Ming: Shun Lang
Association required:
Maidens of the Spear:  Sulin
Losthaven Guard: Captain Jonathan Tredwel
Guild required:
Aisenshi: Musashi
Hawkmen: Shayera
Knights of the Round Table: Sir Lancelot
Nizari: Hasan Wanders
Quest required
Corna: Marshall Osaka