Hrunting

Hrunting (フルンティング) is a sword wielded by the Knight Leader, based off a sword used by Beowulf.

Etymology
In Nordic folklore, Hrunting is a sword, tempered in blood, which was given to Beowulf by Unferth, which supposedly never failed anyone who wielded it. However during Beowulf's battle with Grendel's mother, the sword failed him and he was forced to discard it.

Appearance
Hrunting initially appears as a long-sword with a blade 3cm wide and 80cm long with a silver surface covered in dark-red. Enhanced, the sword can take on a gigantic form about 3.9m long, a similar size to William Orwell's Ascalon.

Principles
Hrunting is meant to become tougher and sharp from the blood of slain enemies. The Knight Leader has Telesma act in place of blood to gather a large amount into it, giving in tremendous destructive power. Ordinary physical laws don't able to the sword in this state, with it being lighter than its original mass should, tough enough to not receive a single scratch from a weapon such as Ascalon and sharp enough to kill someone such as William Orwell should a single strike hit him.

In constructing Hrunting, the Knight Leader analyzed the patterns and laws behind various legendary weapons from different mythologies, such as the Norse Gungnir and Mjölnir, the Celtic Fragarach and Brionac, and others. He then combined and condensed them, refining them into single attack patterns which he can use, and constructing completely new spells in the process.

The way in which the laws and powers have been combined and condensed, resulting in the evolution which produced the power of Hrunting, has been compared to what happens when a star grows too large, undergoing gravitational collapse and forming a black hole.