Editing Yagura:SRD:Attack of Opportunity (section)

=====Threatened Squares=====

You threaten all squares into which you can make a [[Yagura:SRD:Melee Attack|melee attack]], even when it is not your action. Generally, that means everything in all squares adjacent to your space (including diagonally). An enemy that takes certain actions while in a threatened square provokes an attack of opportunity from you. If you’re unarmed or armed with a non-melee weapon (such as a bow), you don’t normally threaten any squares and thus can’t make AoOs.

======Reach Weapons======

Most creatures of Medium or smaller size have a reach of only 5 feet. This means that they can make [[Yagura:SRD:Melee Attack|melee attacks]] only against creatures up to 5 feet (1 square) away. However, Small and Medium creatures wielding [[Yagura:SRD:Weapon Categories#Reach Weapons|reach weapons]] threaten more squares than a typical creature. In addition, most creatures larger than Medium have a natural reach of 10 feet or more.