In contrast with his disturbing appearance, Hassan was very loyal. He accepted the authority of his Master and would never betray him. He lacked intelligence after materialization, but that was remedied dramatically after eating Cú Chulainn's heart. Since then, he was also influenced by Cú Chulainn's personality.[7] He is especially devoted to the Saracen people among whom he once lived, especially the boy Rushd, the child of his former love interest.
Later in the movie, True Assassin is observing Shinto when he is confronted by Lancer, who had shadowed him since witnessing Caster's death. He throws dirks at him but they're easily dodged and deflected by Lancer. Retreating he eventually lands on a trailer with Lancer in pursuit, and not even detaching one of the cars slows the knight down. Lancer jumps onto the trailer and fights True Assassin, who is able to defend himself though cannot compete with him in melee combat. Eventually jumping from the trailer destroyed from their fight, True Assassin lures Lancer to Ryuudou Lake. Keeping out the water, he watches as Lancer is pursued by the Shadow and tries to defend himself with a rune barrier only for it to be easily destroyed by the the Shadow. Then, while Lancer prepares to throw Gáe Bolg, True Assassin unleashes Zabaniya and crushes Lancer's real heart by crushing the fake heart created from the Noble Phantasm. He then quickly tears out Lancer's heart from his chest and eats it as the Shadow consumes Lancer.
A conspirator in Ritsuka's plan to help Jeanne Alter Santa Lily, Cursed Arm meets with EMIYA ahead on Alter Lily's party as they travel toward the sea. Cursed Arm finds the situation ridiculous and questions why they have to interfere. EMIYA answers nothing can be done for Alter Lily if her heart doesn't change. He calls Alter Lily a paradox for trying to be a wish granter while not understanding what it means to grant wishes. To be Santa is to have your wish granted by granting others' wishes. But Alter Lily lacks that, so if left alone, she will lose her reason to live and maybe lose her identity. Worse, she is a version of Jeanne d'Arc no one believes in nor is aware of as she is a fake created by the Holy Grail. Jeanne Alter barely became a Servant after many trials, so her being in a Lily state makes her materialization even less stable. It was for that reason Artoria Alter passed the role of Santa to Alter Lily.
He is fully formed after drinking every last bit of blood, but he is still somewhat undeveloped, shown his inability to speak human language. He could originally only make chirping sounds like an insect, but later is able to speak while displaying a strained speech pattern. He needed more experience in order to be fully functional, so he devours Cú Chulainn's heart to add to his own intelligence. Afterward, he is able to speak fully and rationally without showing any of the previous insect-like qualities. Artoria noted that his voice is strong and clear in contrast to his appearance, and that it is similar to that of Cú Chulainn.
He drives the opponent into a corner by cutting their limbs and tiring their bodies, all in preparation for his fatal attack, his Noble Phantasm, Zabaniya: Delusional Heartbeat. Even if they are in preparation, they are still meant to kill, so he notes that Kirei Kotomine's ability to last against them as long as he does is admirable. The daggers are merely to analyze the target's skill, create the perfect opportunity, and then smash their heart with his arm. Once he knows their capabilities and is assured that they are tired and wounded, he measures out a fatal strike to be blocked so that he has time to utilize Zabaniya.
The ritual is a chore for him that brings him no joy, but it can also be a weakness if the ritual is known to the enemy. He sticks to it methodically, so having seen it through Cú Chulainn's eyes allowed Kirei Kotomine to form a countermeasure and temporarily defeat Hassan. Zabaniya creates a copy of the opponents heart for Assassin to crush, but it has no effect on Kirei's blackened heart.
Hassan's Noble Phantasm is Zabaniya: Delusional Heartbeat. It is the right arm of ShayṭānWP, a cursing hand of the Middle Eastern magecraft specialized in curses that curses humans to death. He normally keeps wrapped in cloth, making it seem like a useless appendage without a hand. It creates a mirror image of the heart of the target with an Ether Clump. By crushing the fake heart, he can crush the real one with this curse without laying a finger on it. It is also possible for Hassan of the Cursed Arm to devour the heart and gain the opponent's intelligence. This may not mean instant death to some opponents, allowing for the chance of a final counterattack before death.[25]
The ability completely neutralizes all physical barriers and armors by only interacting with the fake heart, meaning that all physical defense and distance is rendered meaningless. To resist the curse the target must stay out of Hassan of the Cursed Arm's range, have a high enough mana to prevent the overlaying existence from even being created, or have a high enough Luck to avoid it.[26][27] [3] It is unable to curse evil spirits or those affected by their curses. When used against Kirei Kotomine, whose heart is under the curse of Angra Mainyu, Hassan simply felt no solid response from the ether clump, as if the heart was empty.[1]
Hassan-i Sabbah
Class: Assassin
Master: Matou Zouken
Alignment: Lawfully Evil
Sex: Male
Height: 215cm
Weight: 62kg
Armament: dirk
STR: B
CON: C
AGI: A
MGI: C
LCK: E
Noble Phantasm: C
Legend
The legend of the "Old Man of the Mountain" appeared even in The Travels of Marco Polo. He was the head of an order of assassins who sought out promising young candidates and recruited them with promises of food, drink, and women, in exchange for assassinating important figures.
This legend had its origins in the 11th century. It originated with Nizari subbranch of Ismāʿīlism, a branch of Shia Islam. They were known as a radical sect. The progenitor of the Nizari was Hassan-i Sabbāh himself. Hassan, who had deep connections to the fallen Fatimid Caliphate, opposed the great Seljuq dynasty, repeatedly assaulting it with war and assassination. The tales of the "assassin order" in later centuries were based on this historical truth.
In the world of Fate/stay night, the name Hassan-i Sabbāh was a title among the Nizari people, whose heir would remove his or her nose and skin to become a faceless person. It is believed that the origin of the term "assassin" is either Hassan's name, or the hashish that he used as a brainwashing drug. Hassan's summoning catalyst is the Assassin class itself. For this reason, a properly summoned Assassin will always manifest as Hassan-i Sabbāh.
Tactics
Hassan appears only a few times in the story. Normally, he moves stealthily, collecting intelligence per the orders of his Master, Matou Zouken. Hassan only shows himself when it is time to kill an enemy.
Hassan himself not a strong Servant. He displays his combat strength through surprise attacks, and is ill-suited to frontal assaults. Thus, Hassan waits for opportunities to arise with an invariable/absolute/certain chance of killing the target. There is no need for him to pursue the superhuman Servants. Instead, he waits for the perfect chance to get close to a Master, whom he can easily defeat...
Class Abilities
Presence Concealment: A+
The greatest weapon of the Assassin class is Presence Containment. When this power is activated, it is possible to completely cut off one's presence. When Hassan is so concealed, it is impossible even for a Servant to sense his presence. One would not be able to tell if Hassan was approaching, if he had already left the area, or if he had even been there in the first place... Thus, Hassan is able to gather intelligence with impunity. Security systems of any kind are meaningless before him.
Also, Hassan-i Sabbāh is a being created from the nineteen people that inherited the name. When Assassin is summoned, one of those nineteen individuals will appear. Naturally, Assassin's abilities and Noble Phantasms change depending on which Hassan is summoned. However, the excellent Presence Containment skill is a class ability, so it is shared by all Assassins. As described above, each Hassan has removed his or her nose and skin to create a faceless appearance, which carries the significance of being "nobody." It is hypothesized that the anonymity of being "nobody," the elimination of the self, also influences Presence Containment's ability to "hide oneself." Incidentally, the nineteen Hassans each have unique personalities, so the reader should take care to remember that they are not emotionless fighting machines.
Each of the "Hassans" are not quite Heroic Spirits, but rather mere wraiths (Heroic Spirits are heroes that have left their names in history, and assassins have no names). In comparison to the other Servants, Assassin's combat ability is lacking. However, the discussion changes if Assassin uses Presence Containment to obtain a perfect killing opportunity. Even if the first blow fails to defeat the enemy, Assassin can conceal himself again with Presence Containment, and vigilantly await another opportunity. As a matter of fact, even the formidable Cu Chulainn was easily defeated when he faced Hassan.
Nonetheless, there are weaknesses. In the moment that the user launches an attack, the rank of Presence Containment dramatically decreases. A normal person would fail to notice the killing intent and be sent to the world beyond. However, Hassan's opponents are Servants. For example, with Artoria's Instinct, it is possible to sense the presence of a trap and respond to it. Strategic planning on the Master's part is essential to make the best use of this crafty Servant.
Personal Skills
Projectile (Daggers): B
Hassan's main mode of attack is to throw dirks, a type of dagger that originated in Scotland. His daggers have the same destructive power as firearms when thrown, spelling certain death for a human target. Interestingly, Hassan will never fail to recover all of his thrown daggers after battle, perhaps out of a possessive quirk of personality, or an aesthetic desire to only use his favorite weapons.
Caption: Hassan silently closes in on Kotomine Kirei. Hassan threw his daggers, but Kotomine fended them off.
Protection from Wind: A
In the Middle East, there are legends that typhoons are caused by evil wind gods called djinni (alternately "jinn," "jinnaye"). Divine Protection from Wind is a chant that offers prayers to God, that oneself might receive a charm of protection against the calamity of such evil spirits. To call it a "charm" smacks of superstition, but the strength of its warding is tremendous. Hassan used this skill to resist Artoria's powerful "Bounded Field of the Wind King -- Invisible Air."
Caption: Hassan uses Divine Protection from Wind. A hidden, sacred charm is woven, and his body is imbued with its divine protection.
Self-Modification: C
As its title suggests, this is the ability to alter oneself by connecting one's own flesh to another body. One can increase the length of one's legs, for example, resulting in a form far removed from that of a proper Heroic Spirit. Hassan, whose abilities are below that of the other Servants, uses Self-Modification to enhance his physical performance and make up for his deficits. In the story, he seized Cu Chulainn's heart and introduced it to his own body.
Caption: Hassan, deformed via Self-Modification. His right arm is changing into the arm of the devil Shaytan.
Noble Phantasms
ZabaniyaDelusional Heartbeat
Rank: C
Type: Anti-Unit
Range: 39
Maximum Targets: 1 Person
The assassination technique, "Delusional Heartbeat: Zabaniya," that uses Hassan's cursed arm. Hassan connects his arm to the arm of the devil Shaytan (Satan in Christian cosmology). This ability specializes in cursing people to death.
A mirror image is taken of the target to be killed, and from this mirror an ether clump is used to create an exact double existence. This double existence has a property of resonance with the original, so that if the double existence is harmed, the original will suffer the same damage. This can be considered sympathetic magic, albeit of an extremely high level. With this technique, an imitation heart belonging to the target is crushed, and the target dies without any outward sign of injury as its heart alone is pulverized. All armor is meaningless against Delusional Heartbeat's attack. No matter how mighty the foe, they cannot withstand this Noble Phantasm which directly assaults the inner organs. It is indeed a terrifying Noble Phantasm worthy of an assassin.
Defending against Zabaniya
Delusional Heartbeat is a Noble Phantasm of absolute death. However, as with other Noble Phantasms, it is neither invincible nor perfect.
The ability's effective range is limited, so if one retreats past this distance and uses long-range attacks, Assassin is helpless. Also, Delusional Heartbeat is a curse, so it may be ineffective against Servants with high Magic Resistance, while targets with high Luck may be able to evade it. Additionally, there is the critical fact that the heart organ is not the vital point of a Servant. There also exist exceptional opponents such as Servants that can move without a heart, or individuals that are unaffected by a destroyed heart such as Kotomine Kirei.