Ig-Alima

is a "long and unrefined" gigantic Divine Construct sword contained in the Gate of Babylon. Like its paired sword Sul-sagana, Ig-Alima was possessed by the war god , named after his children. There is a possibility that Gilgamesh named the swords after those of legend, such as with Ea, so it is unknown if it is the genuine sword or simply crowned with the same name. 
The sword possesses the concept of "skyline," the principle "through which heaven and earth are absolutely separated." Granted the alias , it is a sword able to cut "even through a thousand mountains." Through its concept, it does not cut with only its blade or break things apart with only its mass, the principle of separating heaven and earth leaking into the very brandishing of the sword allowing it to easily sever that which cuts. It should normally only able to be countered by an equal Divine Construct, and the act of breaking its blade should be impossible. On Illyasviel von Einzbern being able to break the sword in her Zwei form, it is commented, "That a magical girl could accomplish that once is astonishing, but — it stands to reason. Because the star the girl wished upon shines preciously even in the crepuscule of despair that makes heaven and earth prominent, and overshadows the endless field with its light."
While normally unable to be wielded, Gilgamesh's gigantic corrupted form is able to wield it along with the Shield of the Gods, allowing it to easily chop through a forest with a single swing.Fate/kaleid liner PRISMA☆ILLYA 2wei! - Chapter 26: "Black Fate" When launched from the Gate of Babylon, it can be used as a large, crushing projectile, and it can be dropped from above an opponent horizontally to crush them with its massive size.Fate/kaleid liner PRISMA☆ILLYA 3rei!! - Chapter 18: "The Penultimate Truth" It can be laid against a structure to utilize it as a rampart,Fate/kaleid liner PRISMA☆ILLYA 3rei!! - Chapter 22.2: "One Hand Takes, Another Hand Saves" and multiple people can engage in battle upon its width without difficulty.Fate/kaleid liner PRISMA☆ILLYA 3rei!! - Chapter 23.1: "You're Not Alone"Fate/kaleid liner PRISMA☆ILLYA 3rei!! - Chapter 23.2: "Twin Swords and Two People"Fate/kaleid liner PRISMA☆ILLYA 3rei!! - Chapter 24: "Broken Doll"
As a Divine Construct, it shouldn't be possible to replicate the sword with the Gradation Air of Unlimited Blade Works, but the power of the Holy Grail makes it possible for Shirou Emiya to superficially project the paired Divine Constructs and counter them. The reproduction is named .Fate/kaleid liner PRISMA☆ILLYA 3rei!! - Chapter 39: "Thank You and Farewell" Through the limitations of projection, the resulting sword is hollow within.
==References==
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Category:Noble Phantasms
Category:Swords
Category:Unclassified Noble Phantasms
Category:Unknown rank Noble Phantasms
Category:Divine Constructs
Category:Noble Phantasms introduced in Fate/kaleid liner PRISMA☆ILLYA
Category:Noble Phantasms in Gate of Babylon
Category:Noble Phantasms in Unlimited Blade Works