Beckoning Chill (Su)
Source: Advanced Class Guide, p. 45
The shaman causes one creature within 30 feet to become more susceptible to the sapping powers of cold for 1 minute. When a creature takes cold damage while under this effect, it is entangled for 1 round. If the creature takes cold damage while already entangled by beckoning chill, the duration of the entangled condition increases by 1 round. Once affected, the creature cannot be the target of this hex again for 24 hours.