As an action, you can create a bag of sticky, adhesive, black tar. As an action, a creature can throw the bag at a point within 5 meters, where it bursts on impact. Sticky, adhesive, tar covers the ground in a sphere centered on the point and turns it into difficult terrain for the duration.
When the tar appears, each creature standing in its area must succeed on a Reflex saving throw or be restrained. A creature that enters the area or ends its turn there must also succeed on a Reflex saving throw or be restrained.
A creature restrained by the tar or one that can touch the creature can use an action to make an Acrobatics or Brawn check (its choice) against your alchemical save DC.
On a success, the target is freed.