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From Pathfinder Impossible Magic, which isn't enabled.

Binding Coil (Greater)

ITEM 13
Price 450 gp
Usage affixed to weapon
Bulk —
Category talisman

Activate (concentrate)
Trigger Your Strike with the affixed weapon damages a creature
Requirements You're an expert in Athletics.

This talisman, a bright red coil that is warm to the touch and faintly resembles a serpent, wraps entirely around your weapon. When you activate this talisman's effect, attempt to Grapple the creature you damaged; on a success, one end of the coil wraps itself around the target. This has a Grapple's normal effects, except that the DC to Escape is 30 and you can move without freeing the creature as long as you don't move further away from it.

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