knife  - Mastery of combat with short, pointy things.
blunt- Mastery of combat with blunted objects
projectile- Mastery of combat with weapons which fly through the air
blade- Mastery of combat with long pointy things
two handed- mastery of combat with weapons that require both hands

fighters are good in all skills, but excel in blade
rogues excel in knife, and are good with projectiles
monks excel with projectiles, and are good with blunts
mages excel with blunt weapons
clerics excel with blunt weapons