Gram

is the "Sword of the Sun" wielded by Sigurd in the Völsunga saga of Norse Mythology. It was originally an enchanted sword wielded and pulled from the trunk of a by Sigurd's father, Sigmund; later, it shattered from clashing against Gungnir and was reforged anew into a cursed demonic blade that was capable of killing even a Dragon by Sigurd. After that, it became renowned as a "demonic sword of both glory and ruin." 
Gram is said to be the strongest demonic sword that can only be equaled to the strongest holy sword Excalibur, so it possesses the special characteristic of "Dragon Slayer". The weapon is said to appear in the , a legend of a knight equal to that of King Arthur under the appearance of Balmung, but it is rather called the "origin" of Balmung that was wielded by Siegfried.
The incident of Gram being pulled from the tree by Sigmund within the halls of King Völsung is a legend of a "sword of selection" originating with the sword Merodach.Fate/strange Fake - Volume 2 Gram itself, "the sword of supremacy in the tree" from Northern Europe, was the model for Caliburn, the sword in the stone possessed by King Arthur.Fate/stay night - Fate route: What I want to protect
An uncommon Noble Phantasm that came into existence as a magic sword, despite possessing the attributes of the sun. Bestowed by his ancestor Odin, this sword is a rare weapon that not only selects a king, but simultaneously brings about glory, jealousy, ruin and fate. Its design differs between Gilgamesh and Sigurd's possession of the weapon, no doubt due to the reforging it underwent.
In Fate/Samurai Remnant, it is shown capable of creating a slash in midair that creates a series of explosions a moment later, similar to Arondight Overload.
==Variations==
===Gram (Reforged)===
Sigurd’s Demonic sword, Gram, was once shattered into fragments in a clash against Odin's Gungnir, by Sigurd's father, Sigmund. However, through the process of restoration, Sigurd has reforged the weapon, having connected the broken segment of the blade to the pommel, thus making it a double-blade Sword.https://fusetter.com/tw/NkLQIX0w#all It glows emerald for some unknown reason.
When possessed by Surtr, he gains access to an extraordinary source of Magical Energy. Even in his first stage, "Sigurd" manages to melt the external armor of the Shadow Border very easily. Melting it may be one thing, but he even cut his way down the multilayered Bounded Fields surrounding the inner hull which had been designed back at Chaldea by Da Vinci, Nitocris and Paracelsus to ensure they'd be as strong as any from the Age of Gods. It should have been as strong as a fortress made of divine iron, yet Sigurd sliced through them like so much butter without even revealing his True Name. Da Vinci also claims that its Magical Energy is right up there with Ivan's. Although Holmes is able to stop him from using it thanks to his great combat experience, Sigurd ultimately cuts off his arm. In his stage 2, he is granted authorization to fully employ this Noble Phantasm in combat. At his peak, in his final ascension, Sigurd can create fire by simply swinging his sword without inscribing any Runes. It becomes more powerful than anything they had seen before in that Lostbelt.
Sigurd is also shown using four daggers with similar coloration as Gram, two of which are named and , which he levitates and punches at his enemy.
===Bölverk Gram===
 is the Noble Phantasm of Sigurd. The full power release of Gram, which is originally an Anti-Unit Noble Phantasm. Instead of releasing Magical Energy from the sword, Sigurd draws out the power of the sword and throws it as an "Anti-Fortress" Noble Phantasm.
"I think throwing it is more effective" is what Sigurd believes.
The thrown sword strikes the target while scattering flames, and right after that, Sigurd slams his fist into Gram's hilt at full strength. Bölverk means "he who causes disasters", which is an alias of Odin, his ancestor.
==Development==
Hirokazu Koyama is the weapon designer for Gram in Fate/stay night.
Shirow Miwa is the weapon designer for Gram (Reforged) in Fate/Grand Order.
==References==
vi:Gram
Category:Noble Phantasms
Category:Swords
Category:Anti-Unit Noble Phantasms
Category:Anti-Fortress Noble Phantasms
Category:A rank Noble Phantasms
Category:Noble Phantasms introduced in Fate/stay night
Category:Noble Phantasms in Gate of Babylon
Category:Dragon Slayer Noble Phantasms
Category:Noble Phantasms of Odin