Slings encompasses both the Warrior skill and the weapon class it enables one to use.
NOTE: this class is not fully implemented and has limited functionality.
List of Slings
In Game Description
Warrior Skill Group: Individual skills: Bows Crossbows Projectiles Slings This group deals with those weapons which are fired in some way, including bows and crossbows. Practicing one skill within the group will increase the others to a lesser extent, reflecting the similarity in the skills.