Ballistas
Thirteen of these huge siege weapons are set into the parapets of Salt in Wounds, massive ballistas that are rebuilt and maintained after first being used to bind the Tarrasque. While not currently loaded with immoveable harpoons, they still maintain that capacity (should the need arise to again fire an enchanted bolt) though their regular ammunition is capable of causing massive damage and (hopefully) overwhelm the Tarrasque’s ability to regenerate should the need arise.