All of the following are class features of the binder.

Weapon and Armor Proficiency: A binder is proficient with all simple weapons, and with light armor

Soul Contract (Su): Through special methods known only to binders, you can contact supernatural entities known as vestiges. Whether they were mortal souls strong enough to shatter the cage built by death, wayward outsiders too willful to cease existence, or dead deities unable to lie quietly in their astral graves, vestiges are the outcasts of the cosmos. They exist in the far vacuum between the stars, and they constantly desire for any small taste of reality. 

When a binder offers a pact with a vestige, a binder offers a degree of influence over him by the vestige, in return for the supernatural powers that the vestige grants. Once a binder makes a pact with a vestige, he gains an item that represents their pact. This item must be an amulet, ring, staff, wand, or a weapon, and always of masterwork quality. Without this object worn or in hand, a binder is cut off from his vestige and unable to draw upon any of his supernatural abilities.