Weaponskill is a Kai discipline. Every new Kai is taught to fight with both ranged and melee weapons. This discipline represents the consummation of that training with a single melee weapon. A Kai Lord with weaponskill that wields his particular weapon enjoys an extra +2CS. The weapons used with weaponskill are:
Weaponskill also provides a bonus when ranged weapons (bows and blowpipes) are used, and allows the user to identify certain herbs and potions.
Uniquely for weaponskill, a Kai Lord cannot choose what weapon to specialize in; he or she learns one via the Random Number Table instead. This is changed in the more advanced versions of the discipline.
The Magnakai and Grand Master versions of this discipline are Weaponmastery and Grand Weaponmastery.
Weaponskill is referenced a total of 10 times in the books.
| Book | Times |
| Flight from the Dark | 0 |
| Fire on the Water | 3 |
| The Caverns of Kalte | 2 |
| The Chasm of Doom | 3 |
| Shadow on the Sand | 2 |