Kronos' Scythe is Kronos' symbol of power. It was gifted to him by his mother Gaea to dethrone his father, Ouranos. His own son, Zeus later used it to cut Kronos into one thousand pieces and banish the remains to Tartarus. It was also wielded by Luke Castellan in the form of a sword known as Backbiter, a weapon made of steel and Celestial Bronze.
The Scythe was initially forged by Gaea, for her one Titan child who would dare to wield it against Ouranos. Only Kronos, the youngest, but the bravest and craftiest agreed to do so. While Ouranos was held down by Hyperion, Iapetus, Krios, and Koios, Kronos brutally castrated his father with the Scythe, and proceeded to slice him into a thousand pieces. Shortly thereafter, Kronos became Titan King of Mount Othrys, making the mighty Scythe his personal symbol of power. While not wielding it, Kronos would hang it on the wall, beside his Black Throne. His siblings would take to rarely visiting him, as they feared his infamous scythe.The Lightning Thief, Luke swears an oath of unwavering loyalty to the Titan King, and gets ahold of the scythe, though in its sword form, Backbiter. Luke was first seen using Backbiter in the Sword Fighting Arena. Luke used the sword to rip open a portal and vanish from Camp Half-Blood.
Luke used the sword to fight Thalia. In the end, however, Thalia prevailed, knocking the sword out of his grasp.
Luke did not have his sword, as it was being reforged back into the scythe by the Telekhines that work for Kronos. According to Percy, the scythe looks so terrifying, that his "blood turned to ice" when he saw it for the first time.
Kronos is seen using his scythe many times throughout the Battle of Manhattan. When Percy, Grover, Thalia, and Annabeth go to Olympus, trees are shredded, ground leveled, and paths were turned to rubble. It is said that this was caused by the scythe. In his final fight with Percy, Kronos turns his scythe back into Backbiter because Percy challenged him to a sword fight. During the battle the sword was knocked into Hestia's hearth, but when Kronos tries to retrieve it, Hestia superheated it so he couldn't touch it. With the destruction of Kronos, it melted into a pool of molten metal. It is unknown if Hestia did this, or if it was destroyed when Kronos was defeated, though both are possible.
Kronos' scythe is an extremely powerful weapon, surpassed only by Poseidon's trident, Hades' helm, and Zeus' master bolt. One hit from the scythe can release enormous amounts of energy into a person, "severing their soul from their body" with a single touch. Because of its blade, which is made of half steel and half celestial bronze, it can harm both mortals and immortals alike. In Percy Jackson's Greek Gods, it is mentioned that Kronos' relatives typically abstained from visiting him due to their avid fear of the scythe.
- Soul Destruction: Kronos' scythe released immensely potent shards of energy through a beings souls upon physical contact. In The Last Olympian, Percy felt immense pain and deliriousness when merely grazed by the scythe. So powerful were the scythe's cuts, an immortal would not be able to regenerate from its wounds, with both their body and spirit being scattered.
- Scattering: The scythe was even able to destroy the most powerful of immortals, such as the Protogenos Ouranos. Ironically, Kronos was not immune to its power, and only partially regenerated after millennia, abounds of chaos, and the dedication of hundreds of demigods. However, when Luke killed himself, Kronos' spirit returned to its previous state.
- Divine Energy: The residual divine energy within the scythe presumably granted Luke the ability to teleport at the end of The Lightning Thief.
- Energy Channeling: Kronos was able to channel his Titanic energy through the scythe. Most notably, in The Last Olympian Kronos slammed his scythe into the ground to erect a barrier that repelled Hades, Demeter, and Persephone from advancing to the Empire State Building (despite Hades' fiercest attempts).
- Transfiguration: Kronos could shift the form of the scythe into its sword form.
The Scythe is six foot long, blade curved like a crescent moon, with a thick handle wrapped in leather. The blade of the scythe is made from the same material as Backbiter, meaning that it is a mix of tempered steel and Celestial Bronze. According to Percy in The Battle of the Labyrinth, the Scythe looks so terrifying, that "[his] blood turned to ice" when he saw it for the first time. As shown in Percy Jackson's Greek Gods, all of Kronos' siblings, nephews and nieces rarely visited him, since they all secretly feared his wrath, and his mighty Scythe.
- Gaea (in Percy Jackson's Greek Gods) - forger of the scythe. She later gave it to Kronos so he could defeat his father. He was the only Titan brave and ruthless enough to wield it.
- Kronos (In Percy Jackson's Greek Gods, The Battle of the Labyrinth and The Last Olympian) - as a scythe. (Real Form)
- Luke (In The Lightning Thief, The Sea of Monsters, The Titan's Curse, The Battle of the Labyrinth) - as Backbiter.
- As shown in Percy Jackson's Greek Gods, the scythe was initially forged for Kronos by Gaea herself. Hence, Kronos' scythe is the first known symbol of power created for an immortal.
- Kronos' scythe is the only known divine weapon that has destroyed the bodies of two immortals (Ouranos, and later Kronos himself).
- As seen in Percy Jackson's Greek Gods, Kronos would often hang the scythe on the wall, beside his black throne.
- While the scythe was being reforged by the telekhines, it was cooled in blood. This is a process that the Norse use when crafting bone steel.
- In some myths however, the scythe is described as a blade made of flint, diamond, or adamantine, a mythical metal from Tartarus, said to be indestructible.