From Halopedia, the Halo wiki
The Grappleshot was the product of Project MAGNES, which began in 2549. The Grappleshot fires a grappling hook that can attach to a surface and pull its user towards it, allowing for easier traversal of their environment.
The grappleshot consists of a magneto-impulse projector, a high-tensile nanofiber line, and a self-sharpening Titanium-A fluke contained inside a compact, modular casing. The device interfaces directly with the user's MJOLNIR armor and BIOS systems. The grappleshot has a limited range of eight meters and the fluke cannot always attach itself to ultradense armor plating or energy shielded surfaces. Only augmented personnel can use the grappleshot without extreme risk of injury.
The Grappleshot is a piece of usable equipment in Halo Infinite, which the player can use to move rapidly towards a location or enemy. It can also be used to retrieve distant items, such as fusion coils or a gravity hammer. The grappleshot can also be used to stagger Kig-Yar Freebooters and Raiders, knocking their hand-held shields aside and briefly rendering them exposed. The grappleshot itself also deals minor damage, enabling it to finish off severely damaged enemies. After use, the grappleshot has a short cooldown time before it can be used again. If the grappleshot fails to connect to a surface, is used to stagger a Kig-Yar, or is used to finish off a wounded enemy, the cooldown will not be triggered. Like other pieces of equipment in the campaign, the grappleshot can be upgraded by collecting and spending Spartan cores.
In the campaign, the Grappleshot can be upgraded using Spartan cores.
While the Grappleshot's first in-game appearance occurred in Halo Infinite, the idea of a grappling hook has been around for many years, with Bungie or 343 Industries trying the mechanic on several prior Halo titles, ultimately shelving it due to the mechanic not working well.
List of appearances