Pins target and temporarily prevents it from performing any actions.
Shadowbind was originally known as Pin in the earlier versions preceding the Nintendo DS, and Needles in the J2e translation, Shadowbind is a Ninjutsu spell usable by Edge that inflicts Paralyze on one target. It has a casting time of 0, costs 5 MP in all versions but the 3D remake, where it costs 15 MP instead.
Shadowbind is a job ability of Rangers that ability becomes available at level 40. It allows the Ranger to Bind an opponent, stopping him in place for a short period of time. With the exception of some Notorious monsters that are immune to Bind, this status cannot be resisted. This status cannot be removed with Erase.
Shadowbind is a special skill found on the Soldier of Peace garb. It has a strength multiplier of 3.0 and no potential to combo. It consumes 150 of Lightning's ATB gauge and also inflicts Daze on the target. It can be assumed that it is supposed to complement Soldier of Peace's other locked ability, Artemis's Arrows, as enemies under Daze suffer twice the normal damage and are unable to avoid incoming attacks. However, it is simply more viable to repeatedly use Artemis's Arrows if pure damage is the desired result, as the Daze effect only has a base duration of 3 seconds making the attack rather redundant while also reducing the customization potential of the garb.
Shadowbind is an ability that can be learned by Assassins. It is learned from the Fey Bow and requires 200 AP to master. It costs 12 MP to cast. It can only hit units on surrounding tiles and causes the stop effect.
There is also a Lunge Tech by the name of Shadowstick, which causes Slow. It is taught by the Silver Rapier and is mastered after 200 AP.