The laser harpoon2, 3, 4, 5, 6, 7, 8, also called the energy harpoon2 or energized hydro harpoon9, was a harpoon-like weapon that served as Hahli's Toa tool when she was a Toa Inika. Hahli used it to channel and focus her elemental power of water, which was laced with electricity due to her nature as a Toa Inika. From it, Hahli could fire a mix of water and lightning.4, 5, 7 The harpoon was filled with pure energy that caused it to glow when in use,10, 11 and it could shoot energy harpoons.1 It could punch through even the thickest protodermis armor.9
The laser harpoon materialized inside Hahli's Toa canister when the Red Star transformed her into a Toa Inika.12, 13, note 1 Presumably, it later transformed into the protosteel talons when the Mask of Life transformed Hahli into a Toa Mahri.14