Aura faint necromancy; CL 4th; Slot none; Price 13,308 gp; Weight 10 lbs.
This weapon looks like the barbed spine of a humanoid.
A spine flail functions as a +2 flail that deals slashing damage and has reach. Unlike most weapons with reach, a spine flail can be used against adjacent foes. On a critical hit from a spine flail, the victim must succeed at a DC 15 Fortitude save to resist being permanently blinded by the blow.
Spine flails are favored by powerful dullahans, who harvest the spines from their first victims. The undead riders have a particular affinity for their personal spine flails, and often maintain a supernatural control over their weapons, causing them to appear or disappear at will.
Craft Magical Arms and Armor, blindness/deafness; Cost 6,808 gp
Pathfinder Adventure Path #63: The Asylum Stone © 2012, Paizo Publishing, LLC; Author: James L. Sutter.