Assassin (アサシン, Asashin?) is an Assassin-class Servant able to be summoned by the Protagonist in the Grand Orders of Fate/Grand Order. He was Grand Assassin (グランドアサシン, Gurando Asashin?) until he removed himself of his rank of "Grand" during the battle with Tiamat.
Assassin's True Name is Hassan-i-Sabbah, the founder of the Hashashin; the first to take upon himself the title of "the Old Man of the Mountain" (山の翁, Yama no Okina?) and the name of Hassan-i-Sabbah. Even so, his actual identity was unknown even to the eighteen individuals who came to inherit his titles. Proof that he in fact existed is nowhere to be found -- except in the certainty that if ever he who takes the seat of Hassan-i-Sabbah strays from his path, there shall come an executioner to part him from his head.
There was within the sect of the Hashashin not a single witness who could attest to the existence of the original Hassan; all of those who encountered him met their end. He who forged the name of "the Old Man of the Mountain" elected to live as an observer who would enact judgment upon the rot and the deviations of the sect. Even though the sect persisted in righteous accordance to the doctrine of Allah, it was inevitable that those avowed to carry it forth would come to sin in the eyes of Man. Thus, for the preservers the doctrine to lose themselves to the desires of man was to the Old Man of the Mountain all the more a sacrilege against Allah.
Namely, the corruption of the sect’s leader, the current Old Man of the Mountain, would mean the decay of the sect. Whether that leader suffered from a corrupt spirit or declining skills, such a person must not bear the name of the Old Man of the Mountain. To decline was to die. He took their heads in forgiveness of their sin, and passed down hope to the next Old Man of the Mountain.
He chose to fight head-on with a greatsword rather than hidden weapons, in honor of his solemn duty to assassinate assassins. To lay eyes upon his skull mask meant that one’s life was over. After bringing the hammer down upon fools who strayed from the doctrine of the order, the skull-masked swordsman would erase anyone who had witnessed him from the world.
It is said that he, who sent many Assassins to oblivion, remained in the shadows until the destruction of the assassin order. The skull-masked swordsman was a living legend, the abyss of assassins, whom no one has ever witnessed.
He is given the nickname of "King Hassan" (キングハサン, Kingu Hasan?) by the Protagonist of Fate/Grand Order. In the 6th Singularity, it is given that he resides within the Holy Shrine of Azrael (アズライールの聖廟, Azurai-ru no Seibyou?), a mausoleum situated in a mountainous region somewhere to the north of Jerusalem.
An assassin wearing a skull mask.
The Old Man of the Mountain comes off as quite the stern and straight-forward individual. He possesses extremely low tolerance for impoliteness, as he almost immediately annihilated the protagonist's group upon their uninvited visit to his temple.
However, he is far from being heartless, simply a man with unshakable faith and strict code of conduct. He was willing to hear his visitor's plea for aid and accept it, but only on the condition that one of the Hassans be willing to die for it.
In his view, for a Hassan to plea for aid, even from their own kind is a grave dishonor to their name and faith, as they are those who must rely on their own individual strengths to preserve through trials and slay their targets. Any Hassan who grows weak and/or becomes reliant on the strengths of others must be dealt with by his blade.
Camelot: The Holy Domain of the Round TableEdit
Approaching the confrontation between the protagonists and the knights of Camelot, the Hashashin attempt to request aid from the Old Man of the Mountain, who is reputed to conceal himself at the Holy Shrine of Azrael.
Upon approaching the shrine, the Old Man of the Mountain puts forth trials to test the characters of the protagonists and the gathered Hassan. Informing the protagonists thereafter that requesting his aid was equivalent in meaning to forfeiting the life of the Hassan of the current generation (Hassan of the Cursed Arm), he relents from enacting his customary cost on account of the circumstances of the Singularity.
Subsequently, he lends the protagonists his assistance during the siege upon the Holy City of Camelot.
Babylonia: The Absolute Frontline in the War Against the Demonic BeastsEdit
Initially taking the appearance of an old, bearded vagrant and assuming the name of Ziusudra (the hero of the Sumerian flood myth), he awaits the protagonist in the city of Uruk -- apparently to again test the protagonist's character. Subsequently, during the protagonists' exploratory mission to the abandoned city of Cuthah, he intervenes when the protagonist's soul is drawn into the Underworld by Ereshkigal.
—the Old Man of the Mountain, to Tiamat
In the finale of the Singularity, the protagonists are able to temporarily trap Tiamat within the Underworld by the assistance of Ereshkigal and Ishtar -- aiming to utilize the Anti-Divinity property of the territory of the Underworld to weaken her. In the midst of Tiamat's attempt to escape to the surface, the Old Man of the Mountain intervenes by slicing off Tiamat's wings and imposing the Concept of Mortality upon her -- stating to the protagonists that he has removed himself of the title of "Grand Assassin" for the opportunity to strike against an Evil of Man. He participates as a guest in the second-to-final confrontation with Tiamat.
Differing from his successors, the Old Man of the Mountain terminates his targets not by imposing physical harm, but by severing 'fate' itself by way of an ability similar to the Mystic Eyes of Death Perception.
The Old Man of the Mountain exercises his abilities by the use of a sword. In terms of skill in swordplay, he is said to be more than a match for the knights of Camelot; able to duel with Gawain while holding the advantage and capable of blocking a strike from Excalibur Galatine with his cape alone, he is capable of creating sandstorms at will and eliminating abstract concepts such as communications with Chaldea or Ereshkigal's alliance with the goddesses opposed to Babylonia. He is furthermore capable of imposing "the concept of death" upon immortal existences such as Tiamat. He has shown usage of blue flames to move in manners akin to teleportation, such as moving behind or above targets, or strike his opponents with multiple strikes in a single swing and creating explosions from a distance.
Assassin has given up his right to be a Grand Servant as of joining Chaldea. Grand Servants exist for the sake of saving mankind, so the position must be discarded to serve as the Protagonist's Servant. Even though his status is removed, his Saint Graph still remains Grand-class for a short time after, not immediately loosing power after becoming a normal Assassin. The power of the Saint Graph was utilized in the strike to grant Tiamat a concept of death, and his Saint Graph became that of a normal Servant's afterward.
Presence Concealment is the Skill to erase one’s own presence. It is the vestige of an ability he learned long ago. The swordsman bears a powerful curse which makes his presence known those whom he will kill next, even if he achieves a perfect success on a check to conceal himself.
The Evening Bell (晩鐘, Banshou?) signals the announcement of funereal proceedings and the visitation of Death. This unique skill manifests as a result of having become one with the rites of passing. The swordsman of the Evening Bell is without agency in his choice of opponents. He brings salvation to those who have lost sight of their mortality in the place of God.
“…Canst thou hear this bell? It tolls for thy destiny’s end. Accept it, and unbind thy soul, for this is thy last chance as a human to slumber in peace”
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 1.16 1.17 1.18 1.19 1.20 1.21 1.22 1.23 1.24 1.25 1.26 1.27 Fate/Grand Order - Old Man of the Mountain, Translation by chaldeum
 Fate/Grand Order, 7th Singularity, Chapter 21 - Prelude to the Final Stand
1: We're falling~!
Indeed, we're falling ... ! Below is -- I can't see it very clearly!
At this rate, we'll die to the plummet before the Goddess Tiamat!
Ereshkigal grants floatation.
I won't permit any such thing.
I hereby bestow to you the privilege to buoy yourself afloat (浮遊権, Fuyuu-ken?, lit. "Privelege of Floatation") within the Underworld (冥界, Meikai?).
Gather your mana (魔力, maryoku?, lit. "magical energy") at the base of your feet, and imagine a surface.
This should grant you a bit of capacity for flight.
Alright, I'll give it a try!
But I'm afraid that salutations will have to wait.
Look over there!
The Underworld is lit with lightning.
That's ... the Goddess Tiamat!?
We've successfully lured her into the Underworld!?
Indeed. Glance upwards. You can glimpse Uruk from here, can you not?
That Ishtar shattered the foundations of Uruk, causing it to collapse into the Underworld (here).
It's over 2000 meters to the surface ...
The Underworld of the Age of Divinities is amazing as expected -- though I'm not sure whether this place would be considered deep or shallow ...
No, more importantly -- what the hell is that!?
A heat source comparable in magnitude to Ishtar's Noble Phantasm is steadily consuming Tiamat!?
It's a defense mechanism (防衛機構, bouei kikou?) of the Underworld.
Any of the Living who trespass in this domain against my permissions are so afflicted.
This is a rule established by the World itself.
And once the process is begun, the end is certain -- even for the Goddess Tiamat.
In any case, what of Lord Gilgamesh (ギルガメッシュ王, Girugamesshu-Ou?, lit. "King Gilgamesh")?
Is it time yet to deliver the final blow?
The man ordered that we stand by until all parties arrive at their stations, but is that truly necessary?
Now would be the time to act, if our purpose is to secure a victory.
That's ... I definitely agree.
But Ereshkigal-san, Lord Gilgamesh is already ...
1: ... even so, if we don't fight
... yeah, I get it. Even if it's just us, we have to do this.
If you're ready, then let's begin!
Leave it to my disgression, for neither Lord Gilgamesh nor Ishtar are needed here and now!
Ereshkigal gathers energy.
I shall settle this alone ... !
O Gallu (ガルラ霊, Garura-rei?, lit. "Gallu Spirits") of the Underworld -- the Spears of Rot (腐敗の槍, Fuhai no Yari?, lit. "Spears of Putrefaction / Degeneration") arrayed before me!
Against that which trespasses, let us bring down the Iron Hammer of the Underworld (冥界の鉄槌, Meikai no Tettsui?)!
All hands, engage!
Destruction rains upon Tiamat.
What say you? I believe it's good as finished. Even the Goddess Tiamat is within the Underworld merely a goddess.
Before the combined onslaught of myself and the Gallu, not a single being -- a single --
Chaos Tide manifests.
Wha -- what --
Chaos Tide (ケイオスタイド, Keiosu Taido?), compromising (侵食, Shinshoku?, lit. "eroding / encroaching") the Underworld!
This is bad! If we leave it alone, the Underworld will be overtaken!
And that's not all ... what is this?
Beast II Saint Graph (霊基, Reiki?, lit. "Spiritual Foundation") signature -- rapidly dilating (膨張, bouchou?, lit. "expanding / swelling")!
The Divine Regression (神代回帰, Jindai Kaiki?, lit. "Regression to the Age of Divinities") of the Saint Graph has advanced unto the Jurassic Era (ジュラ紀, Jura-Ki?).
That's no longer a Divinity (神性, Jinsei?, lit. "Divine Nature")! Unmistakably, it's the very Corpus of a God (神の体, Kami no Karada?, lit. "Flesh of God")!
Eh, eh, eh -- !?
Wh- what's happened!?
Is it something that I've done -- !?
Saint Graph Dilation Operations (霊基膨張工程, Reiki Bouchou Koutei?) has ceased. Continuous reactivation (連続再起動, Renzoku Saikidou?) of Mana Reactor (魔力炉心, Maryoku Roshin?) confirmed ... !
Injuries incurred by the plummet into the Underworld are regenerating!
-- it's come ... ! This is --
This is the true appearance of Beast II!
Tiamat emerges from the Mud.
Clouds of Lahmu spill forth.
The Goddess Tiamat is releasing Lahmu (ラフム, Rahumu?) from her flesh!
They're spreading across the Underworld!
It's impossible, right!? No matter how I look at it, it's impossible!
If it's only us, there's no way we can defeat something like that!
More than that, the tide is upon us!
The Underworld will be taken from me -- !
Don't be sayin' sad things, Sukapon-ta~n! Ain'tcha the Goddess of the Land of Death, nya~!?
Lahmu killed by a spear.
Jaguar Man appears.
That's right! It's a bird; it's a balloon -- no, it's merely your imagination!
I am the Tiger that dashes across the Underworld -- the one that they call JAGUAR MAAAAN!!
1: You're kinda burnt!?
A whole buncha stuff happened, so I'll explain later!
In any case, you did well getting this far, Gudako-san!
2: You came dashing to me!
Yeah, uh-huh. And I totally don't mind the fact that you didn't give me a shout when you got back to Uruk, so don't worry about that.
In any case, you did well getting this far, Gudako-san!
A tiger! A tiger has appeared in the Underworld!
Inconcievable! Is such a thing commonplace in the lands afar!?
It's a thing alright, little girly!
And less chitterin' already! Get back to blastin' away with that awesome attack o' yours!
B- but, it's completely without effect ... !
And the total energy output of the Underworld is dropping off!
Has to be done, even if it's without effect!
Listen up. No matter what it looks like, that right there is the Goddess Tiamat in her very weakest state!
Us! Right here, right now! If we don't do somethin' about this, it ain't just Humanity that's gonna be done for. It'll be bye-bye for the Earth itself!
If she gets back ta the surface in that state she's in right now?
In less than a day, the whole planet's gonna be swimmin' in Black Mud (黒泥, Kokutei?).
That can't be ... Doctor, what she said just now ...
It's the truth!
As of right now, the Chaos Tide has already subsumed the majority of the Underworld!
It can't be permitted to reach the surface! By some means or another, we have to put an end to it right here!
Thankfully, the Chaos Tide and the Lahmu are both of the same existence as Tiamat, and don't actually qualify as "seperate organisms."
So long as she remains within the Underworld, the act of killing Tiamat shouldn't be negated by way of Paradox Restoration (逆説的復元, Gyakusetsu-teki Fukugen?)!
But, there's already so much Mud!
In such circumstances, how precisely are we to properly engage --
What in the world -- !?
Flowers cover the Black Mud.
1: Flowers are blooming ...
2: These flowers. It can't be ... !
The Divine Authority (権能, Kennou?) invested within the Chaos Tide has ceased operation!?
No -- the function (機能, Kinou?) of the Authority's run its course, and the Tide's become nothing more than normal mud!
It sounds impossible, but --
These flowers -- they're somehow depleting (枯渇, kokatsu?, lit. "becoming drained / exhausted") the Goddess Tiamat of her power (力, chikara?, lit. "power, in the sense of an ability possessed")!
Good! Seems that I've made it in time -- !
And to Archaman of the uninspired imagination, I have only this to say!
If you desire to neutralize the Sea From Which Life Itself is Sprung (命を産む海, Inochi wo Umu Umi?), you need only make use of the Life that it births -- investing it within creatures small and innocuous!
This is of course where I come in!
The Magician of the Flowers (花の魔術師, Hana no Majutsu-shi?) arrives, come to make true upon his appellation (二つ名, Futatsu-Na?)!
Merlin drops to the ground before the protagonists.
How are you here!? It can't be that you were resummoned (再召喚, sai-shoukan?)!? No-no-no!
Hahaha, of course not.
It's impossible that I would be resummoned.
This is something a lot less complicated.
I'm the actual Merlin -- the authentic article.
In a rush, I've run here all the way from Avalon (アヴァロン, Avaron?)!
1: This man got here on foot!
2: So, you could actually run here!
Yeah. Seeing as the World's been reduced to a tabula rasa (白紙状態, Hakushi Joutai?, lit. "state of being white paper") by the Incineration of the Common Sense of Man (人理焼却, Jinri Shoukyaku?), I was able to sneak here by way of the Faerielands (妖精郷, Yousei-Kyou?)!
I absolutely despise sad farewells. No matter what, I wouldn't permit a parting by death.
Consequently, I've bent my principles (信条, shinjou?) a bit, and escaped the tower of my imprisonment (幽閉塔, Yuuhei Tou?, lit. "Prison Tower").
Of course, it was for the sake of meeting you all.
Yes! We were waiting for you, Merlin-san!
It's a happy thing that we were able to meet each other again!
Beast II -- dorsal Wing-Horns (角翼, Kakuyoku?) deployed!
See that? With Merlin's provocations, she's decided to get serious on us!
Even if we've prevented Beast II from subsuming the Underworld, her Primary Corpus is still free to act!
She's ascending to Uruk -- to the surface!
1: Her wings have regenerated ... !
2: Merlin, isn't there something you can do!?
... hm. It took the labors of two goddesses to slow the advance of the Primary Corpus (真体, Shintai?, lit. "True Body").
Using the city of Uruk itself as bait, we've lured her to entrapment within the depths of the Underworld.
We've restricted (拘束, Kousoku?) her with the Chain of Heaven (天の鎖, Ten no Kusari?); with the Sanctions of the Underworld (冥界の刑罰, Meikai no Keibatsu?) --
and with my flowers, which are merely beautiful.
Gudako-kun -- and Heroic Spirits all.
For the purpose of reaching this juncture, we have indeed played many a hand.
However, it still isn't enough.
That is a being that is yet to to know Fear (恐怖, Kyoufu?) -- yet to know the meaning of Predation (天敵, Tenteki?, lit. "natural enemy / predator").
She is yet to know the Death (死, Shi?) that He Is Become.
He ... ?
Is there somebody else coming to help?
Oh, indeed there is.
One final trump, held in reserve.
And so, who was it that called Him here, do you suppose?
It wasn't Lord Gilgamesh. It certainly wasn't the Grail of the King of Magecraft (魔術王の聖杯, Majutsu-Ou no Seihai?).
... It shouldn't be necessary to explain it, really.
It was you, Gudako-kun.
He mentioned that it was to repay a favor owed to you that he abandoned (捨てる, suteru?) the Station of the Crown (冠位, Kan'i?, lit. "Crown Position").
And the enemy that stands before us is an Evil of Man (人類悪, Jinrui-Aku?) -- a Beast (ビースト, Bi-suto?).
From the very start, the requisite conditions for his manifestation in this land were met.
The battles that you've fought until now have not been without meaning.
-- It can't be.
You mean, the one that suppressed Gudako's vital signature (生命反応, Seimei Han'ou?, lit. "Life Reaction") when she entered the Underworld was ... !
Glance heavensward, O Sea of Genesis (原初の海, Genshou no Umi?, lit. "Primordial Ocean")!
For there, your Death (死神, Shinigami?, lit. "Death God") awaits!
Ziusudra overlooks the Underworld from Uruk.
... That which cannot die, cannot be said to have lived -- for a life absent of mortality cannot be life.
Yours is an eternity without advance -- a stagnation of endless slumber.
O Beast of Calamity (災害の獣, Saigai no Juu?) -- Evil born of Man.
Your rejection (排斥, Haiseki?) is in the end founded (根底, Kontei?, lit. "foundation") in the very benevolence (慈愛, Jiai?, lit. "love / affection") by which you sought to impose Regression (回帰, Kaiki?).
Though the Station of the Crown is to me unnecessary, there dwells within this blade the Proof of the Strongest (最強の証, Saikyou no Akashi?).
Ziusudra reveals himself as the Old Man of the Mountain.
Old Man of the Mountain:
A Goddess fallen unto beasthood you may be, but being that you are indeed the Mother of Genesis (原初の母, Genshou no Haha?), it is only proper that I give my name.
-- of the Abyss of the Shadowed Valley (幽谷の淵, Yuukoku no Fuchi?), I come to entreat (馳走, chisou?) you with the darkness of Death (暗き死, Anki Shi?).
I am Hassan-i-Sabbah (ハサン・サッバーハ, Hasan Sabba-ha?) -- the Old Man of the Mountain (山の翁, Yama no Okina?).
The Old Man of the Mountain leaps into the crevice of the Underworld.
Old Man of the Mountain:
The Evening Bell (晩鐘, Banshou?) tolls with your name.
Unto the Will of the Heavens (天命, Tenmei?), I consign those wings -- !
The Old Man of the Mountain cuts at Tiamat's wings, eliciting a cry.
-- Beast II Saint Graph Pattern (霊基パターン, Reiki Pata-n?), undergoing reorganization (変化, henka?, lit. "Change") ...
This is incredible ... He didn't merely cut away the Wing-Horns of the Goddess Tiamat; he imposed upon her "the Concept of Death" (死の概念, Shi no Gainen?)!
The physical scale (規模, kibo?) of the Goddess Tiamat remains unchanged, but the underlying Saint Graph has conformed to the standard pattern of a Servant!
She can be defeated!
As of this moment, the complete annihilation of Beast II has become a possibility!
Romani! I've got a read (特定, tokutei?, lit. "identification") on the Saint Graph Core (霊基核, Reiki-Kaku?)!
A bit stereotypical, but it's inside the head! The Saint Graph Core lies not within the heart, but within the brain of the Goddess Tiamat!
-- You hear that, Gudako!?
Target the head of the Beast II.
This is the true and final battle of attrition!
Tiamat sings, releasing a new wave of Lahmu.
Indeed -- and as expected of the Beast II.
In coming finally to appreciate the worth of a life, she has begun to resist in earnest!
Maximizing the birthing of the Lahmu, the Primary Corpus approaches the Walls of the Underworld (冥界の壁, Meikai no Kabe?)!
She intends to climb to the surface!
1: I'm not going to let you escape!
2: But before that, we're definitely going to ... !
Yes, that is indeed the case!
This is well and truly our last chance!
Mashu, Gudako-kun. The salutations of our reuniting can wait until later!
We come now to face the storm itself! Are you ready to make a stand?
-- Yes! Of course we are, Magician of the Flowers!
And Sempai -- I judge that this is the final confrontation (最後の局面, Saigo no Kyokumen?) of the Seventh Singularity (第七特異点, Dai-Shichi Tokuiten?)!
Though I'm weak of heart, please give me my orders, Master!
In order to repay the trust of all of those who have invested their faith in us up until this point --
I'll do everything within my power to shatter that Calamity (災害, Saigai?)!
1: Yeah, let's get to it, Mashu!
This is amazing ... ! My Underworld is filled with so many flowers!
-- no, that isn't right. This isn't the time or place for that.
Now that I've reestablished Jurisdiction (支配権, Shihai-ken?) over the Underworld --
I suppose it's fine. Consider this a one-time service.
I hereby bestow to you all the Privelege of Mobility (行動権利, Koudou Kenri?) within the Underworld, and the reinforcement of all strengths and capabilities (全強化, Zen-Kyouka?, lit. "complete reinforcement")!
As the Mistress of the Underworld (冥界の女主人, Meikai no Onna-Shujin?), I, Ereshkigal, so beseech!
O Heroes of the Surface (地上の勇者, Chijou no Yuusha?), let fall the Iron Hammer (鉄槌, Tettsui?) upon that Wyrm (魔竜, Maryuu?, lit. "Demonic Dragon")!
By the hands of you Humans who have unto the distant future marched, let Heaven and Earth by a linchpin (楔, kusabi?) be joined!
ここで！ 私たちが！ なんとかしないと人類終了どころか地球終了のお知らせよ！
げぇぇぇ、マ――リン！？なんでキミが！？ まさか再召喚！？ いやいやいや！
- ↑ >Nasu: Personally, I feel that joining Chaldea means that you must throw away the right to being a Grand that exists for the sake of saving all mankind. Still, even after discarding that position, the strength of King Hassan’s Saint Graph itself is still Grand-class. It doesn’t mean that once he loses his Grand position and becomes a normal Assassin, his Saint Graph would immediately lose power. So, by using all the might in that superb Saint Graph, the strike that “granted the concept of death” could be performed. And afterwards, King Hassan’s Saint Graph became that of a normal Servant’s.