The subject of this article does not exist on the retail realms anymore.
The categories should reflect this, and should not include retail realm categories.
A weapon master is an NPC that offers characters the opportunity to learn specific weapon skills, the availability of which varies from one weapon master to another. All weapon skills can be trained at level 1 and cost 10, except for Polearms which require level 20 and cost 1.
Training with a weapon master became obsolete in Patch 4.0.1, as all class-appropriate weapon proficiencies are now learned by each class upon creation. Weapon masters were removed from the game shortly after.