A harpoon is a weapon described on UA 77.

A hit snags the target. When snagged, the wielder of the harpoon can take a E action to drag the victim, which does 1 point of damage to the victim and moves them 1“ closer to the wielder.

To get un-snagged:

• The victim must have INT 2 or higher.
• The victim must take an E action if in combat.
• The victim must have some means of dislodging the weapon head or severing the line.
  • If dislodging the weapon head, a saving throw vs paralysis¹⁾ is attempted. Failure means the snagged creature is dragged as above.
  • If severing the line, the line is automatically hit, and damage is rolled. 2 points of cumulative damage sever it.

See UA 77 for additional rules and stipulations. Also see the lasso and net.