Harpoon

Weapon

Uncommon

Special, Thrown

Special: When you deal damage to a creature with a harpoon, the target must succeed on a Constitution saving throw against a DC of 10 + damage dealt or be harpooned. A harpooned creature takes 1 pt of slashing damage at the start of their turn.
If the harpoon has a line attached, either creature can use an action to attempt to pull the other toward it. To succeed at this, make a contested Strength check. The winner of the check pulls the other towards it a number of feet equal to the difference in the checks. The rope holder can drop the rope as a free action instead. Creatures greater than one size larger than other cannot fail this check. If the rope is tied off to an object, then the Strength (Athletics) check is made against a DC of the DM's choosing.

A creature can remove the harpoon from its body as an action. The creature must have at least one free hand to do so. Removing the harpoon causes damage equal to the damage die of the harpoon (without modifiers). Dealing 5 slashing damage to the line (AC 10) destroys the line without causing additional damage to the harpooned creature, but does not remove the harpoon.