100 of the Tranq Spear Bolt is a torpor-inducing type of ammunition. It can only be fired from the Harpoon Launcher.

It can be used to easily knock out creatures underwater. However, it is not effective when used on land, as it will not travel very far.

They do approximately 36 damage per hit and induce 300 torpor. Weapon damage modifier affects base damage and Torpor the same. For example a 300% harpoon gun would multiply both the base damage and torpor by 3x.