This large sword is too heavy to hold with one hand.
In order to obtain the Giant's Knife in Ocarina of Time, Link must open Medigoron's shop with his Bombs as a child. When spoken to as a child, Medigoron tells the young hero that he is working on "something really cool," but that it will take five to six years to complete.[3] When Link returns as an adult, the Giant's Knife will be finished,[4] and it may be purchased for 200 Rupees.[5]
Broken Giant's Knife sprite from Ocarina of Time 3D
The Giant's Knife looks identical to the Biggoron's Sword. However the blade will entirely break off after 8 hits or immediately if Link strikes a solid wall,[6] turning it into the "Broken Giant's Knife." The Broken Giant's Knife can still be used but will only have 1/4 the power of the undamaged version, same as the Kokiri Sword, and its reach will be drastically shorter. While wielding the Broken Giant's Knife, the Spin Attack cannot be used.
The Giant's Knife can only be used by Link as an adult and must be held with two hands, thereby precluding the use of a Shield, even when broken.
The following section is not part of the Zelda canon and should not be taken as such.
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Giant's Knives are tier 1 Giant BladeWeapons that appear as Impa's starting Weapon in Hyrule Warriors. They do not resemble the Giant's Knife from Ocarina of Time, instead more resembling an actual giant-sized knife. They are crafted by the finest Goron smith and are difficult for other Hyruleans to wield, though they bear great strength.[7] They are unlocked alongside Impa after completing the Scenario "The Armies of Ruin". Giant's Knives are associated with the Element of Water.
By pressing the Strong Attack button, Impa can dash into enemies.[8]
Trivia
Strangely, if Link were to avoid ever obtaining a Giant's Knife and then were to instead skip to getting the Biggoron's Sword, Medigoron will still talk to Link as if he has a working, non-broken Giant's Knife even though it is in fact the Biggoron's Sword.
Ocarina of Time contains unused text for the Giant's Knife, meant to be displayed when it is exchanged for the Biggoron's Sword, provided that Link possesses the Giant's Knife. The final version makes no mention of the replacement, and instead the Giant's Knife text is simply discarded.[9] This text is used in Ocarina of Time 3D, however.
The Giant's Knife, alongside with the Deku Stick, are the first items in the series that will break or wear down after regular use. It is succeeded by the Razor Sword in Majora's Mask and the items Link can obtain in Breath of the Wild.
↑I'm working on something really cool right now! But I think it's going to take a while... If you can wait five or six years, it should be ready. OK? — Medigoron (Ocarina of Time)