Weapon Perks

From the introduction:

Weapons are more than just objects that adventurers carry to stab, slice, or break enemies with. In the proper hands of a master, they can be powerful tools to gain the upper hand against an enemy. A weapon perk is a special skill or technique that can be used with a specific weapon. This allows each weapon to feel unique among all of the options the adventurers have, and hopefully give them their own identity.