A length of chain of varying styles that are meant to trip and disarm opponents. Usually 4 feet in length. It can be modified to give reach, subject to DM discretion. And along with the trip ability it also can be mastered to the point that it can be used to grapple but with a unchangeable -2 to all actions, as it is unnatural for the actual chain itself.
Spiked Chain StatsEdit
Base Cost: 25 gp DMG: (SM) 1d6 (M) 2d4
Crit: x2 Weight: 10 lbs.
Special: Disarm, Trip, (Grapple), also though it is not a light weapon, you can still use your DEX modifier instead of your STR as if it was a light weapon.
Core Rulebook; Paizo Publishing