This weapon is similar to a shortspear with a flexible rattan or bamboo shaft and an elaborately barbed head.
Benefit: On a critical hit, the spear grabs flesh or armor. The wielder can then attempt a combat maneuver check to attempt to grapple its opponent as a free action. This grapple attempt does not provoke an attack of opportunity from the creature you are attempting to grapple. While grappling the target with a sibat, the wielder can only move or damage the target on its turn. The wielder is still considered grappled, though it does not have to be adjacent to the target to continue the grapple. If you move far away to be out of the sibat’s reach, you end the grapple with that action.
Pathfinder Roleplaying Game Ultimate Combat. © 2011, Paizo Publishing, LLC; Authors: Jason Bulmahn, Tim Hitchcock, Colin McComb, Rob McCreary, Jason Nelson, Stephen Radney-MacFarland, Sean K Reynolds, Owen K.C. Stephens, and Russ Taylor.