Absolute Grudge Broadsword, Kubidan

Absolute Grudge Broadsword, Kubidan is the evolved form of the cursed weapon, Cursed Grudge Broadsword, Hararetsu that Kurono owns.

Appearance
The blade of the broadsword appears much bigger than the Cursed Grudge Broadsword, Hararetsu, becoming a two-handed sword. Similar to the Cursed Broadsword, Tsujigiri and the Cursed Grudge Broadsword, Hararetsu, it was black from the tip of the blade till the pommel, but it has pulsating crimson lights in the shape of blood vessels on its blade, making it appear much more ominous than both. Also, whenever Kurono inserts his black magic power from the hilt, these red lines pulsates, releasing a great amount of dark-red aura making it appear as if the broadsword is being clad in fire.

Personality
As a part of "her" curse, "she" desires to cut living beings and absorb their blood. "She" also seems to hate cutting creatures without blood like Skeletons but shows an intense liking to the blood of powerful living creatures, particularly Apostles.

"She" believes that if its wielder is sad, in pain, or hates someone, its wielder should just kill them cruelly and gruesomely without any hesitation, mercy, and compassion.

"She" can also be quite moody whenever Kurono left "her", literally flying into him after being separated from him for a long time and does not allow anyone else aside from Kurono to touch "her".

History
After drinking the blood of numerous Crusaders during the Defensive Battle at Alsace, the blood of the 8th Apostle, Ai, multiple Goblins, and finally the blood of Fiona, the broadsword evolved even further as Kurono and the broadsword had both cut their loved ones.

Abilities
As a result of undergoing two evolutions as a cursed weapon, all of its abilities have been greatly enhanced compared to Cursed Grudge Hatchet, Hararetsu. It possess enough sharpness to cut through the Wrathpun's fur while hardening its fur which Hararetsu previously couldn't cut and it is also extremely durable, not breaking even after getting struck by the Greed-Gore's Plasma Breath. Just like the time when it was still Tsujigiri, it still has the function of giving the user knowledge on how to skillfully wield the broadsword even without having trained how to use it. Similar to Tsujigiri and Hararetsu, it is stated to be still capable of absorbing the blood of its victims to use it as a catalyst for it to evolve even further and become more powerful.


 * Berserk (狂化 (バサーク), lit. "Mad Influence"): A Bad Status that the broadsword inflicts on its wielder as its curse. It greatly enhances all of the user's physical abilities and removes their ability to feel pain in exchange for driving the wielder mad. The degree of strengthening granted by this curse is currently unknown after its evolution into Kubidan. Whenever the user is in a Berserk state, their eyes gleams in a red light. Because Kurono uses Blackening on the broadsword, this doesn't normally affect Kurono.
 * Black Calm (黒凪, Kuronagi): Due to its ability to grant its wielder some knowledge on how to skillfully use the Broadsword evolving too, it allows its user to use a Martial Art while using the broadsword. Said Martial Art releases a slash with immense cutting power with more power than the normal Martial Art, Slash. After evolving into Kubidan, it possess enough power to cut the Wrathpun's body while it was hardening its fur which Hararetsu previously couldn't.
 * Bipartite Black Calm (二連黒凪, Niren Kuronagi): A Martial Art where the user performs two consecutive slashes with immense cutting power. It possess enough power to deeply cut the Wrath-Pun's legs when it is hardening its fur. Kubidan gained the ability to allow its user to use this Martial Art after its evolution.
 * Red Calm (赤凪, Akanagi): A long-distance Martial Art that Kubidan learned after its evolution. It releases a crimson blade at the moment of slashing using the blood that the Absolute Grudge Broadsword, Kubidan has sucked. It possess enough power to cut the Wrathpun while it is hardening its fur.
 * Dark Calm (闇凪, Yaminagi): The greatest and strongest Martial Art that Kubidan learned after its evolution. It wraps the Absolute Grudge Broadsword, Kubidan with even more dark aura compared to Kuronagi and releases a slash with far more power than Kuronagi. It is powerful enough to sever the Wrathpun's right arm (which was its hardest body part) while it was hardening its fur with great ease.