From LSWiki

Class: Ranged Weapon Skills

Attribute: Perception
Pedagogy: Physical Training
Practitioner Term: Crossbow User

The ability to use crossbows in ranged combat.  When using a crossbow, this skill influences the speed, accuracy, and effectiveness
of your attacks, as well as how quickly you can reload your weapon.

Development Information: The crossbow skill was created by Chaos and is maintained by Lost Souls; the source code was last updated
Thu Jan 10 02:44:44 2013.

Notes

Trainers

mordor: Badlokk
Liathyr: Celifere
Losthaven: Pryderi
Association:
The Losthaven guard: Terethrond
Guild:
Ordo Ignis Aeternis: Aedryl
Verynvelyrae: Sirinil
Quest:
Corna: Marshall Osaka