The two are Angra Mainyu and his servant, Vlad III.
Since Angra Mainyu was inexplicably resurrected, he and Vlad III have been developing their forces in secret. Using Vlad III's vampire characteristics, many humans have been transformed into low-level vampires.
At first, Vlad III was dissatisfied with being summoned in the Berserker class. Seeing this, Angra Mainyu directly fed Vlad III with the black mud and controlled Vlad III, who was eroded by it.
Now, they have converted about a thousand vampires in Fuyuki and several nearby cities. The group also contains a few scattered magicians. It can be said to be a relatively large force.
And just today, the two of them went out to find someone of value to transform and found Matou Kariya.
"This is an unexpected surprise." Angra Mainyu looked at the Command Spell on Matou Kariya's hand.
"I didn't expect him to be a participant in the Holy Grail War. It seems that this Servant's strength is noteworthy." Angra Mainyu's mouth slightly curled up, revealing a sinister smile, but his strange appearance made this smile very unsettling.
As long as this person is controlled, the combat power here will skyrocket, Angra Mainyu thought.
"Berserker, restrain the other party's Servant and give me time to delay him." Angra Mainyu then gave Vlad III an order.
Vlad III—also known as Grand Duke B—had bright red eyes flashing and a ferocious face. His whole body exuded a black, ominous aura which was out of tune with his sickly pale skin. This was a change caused by the erosion of the black mud.
"Tonight's night is beautiful. Let's indulge in this scenery for a while," Grand Duke B said in a hoarse voice, and charged towards Lancelot with a spear featuring a strange tip like a needle.
"Berserker, deal with him," Matou Kariya hurriedly ordered Lancelot.
Lancelot directly picked up the stick that Uryuu Ryuunosuke had used to attack Matou Kariya before.
[Knight of Owner] activated. The originally fragile club was directly strengthened by Lancelot's Noble Phantasm, and in an instant, this club became a D-rank Noble Phantasm. The entire stick was covered with scarlet fissures.
Lancelot charged at the spear of Archduke B. The two weapons collided like electric light and flint, making a 'clanging' sound as sparks scattered.
Matou Kariya saw this and then rushed out the door. Matou Kariya was not stupid; he knew that the opponents might come towards him. Knowing his own strength and being uncertain of the enemy's, all he could think of was delaying and running.
Angra Mainyu watched Matou Kariya run out and shook his head involuntarily.
Why run? Wouldn't it be nice to come here and eat black mud to be my partner? How good is it to accept the purification of 'all the world's evil' and achieve a new life?*
Angra Mainyu looked at Lancelot, who was fighting with Duke B.
"It's really a strange ability. It can actually strengthen an extremely fragile stick into a Noble Phantasm. Not a bad ability," Angra Mainyu smiled wickedly. Then, without watching the fight, he chased after Matou Kariya.
Lancelot and Archduke B fought into a hall inside the house. This hall was the killing ground of Uryuu Ryuunosuke; tools and torture devices could be seen everywhere on the walls and floors. Among them were many offensive tools such as chainsaws, axes, and knives. These tools, shining with a cold glow, were all marked with bright red blood.
"Hoo!" Lancelot let out a roar and picked up the tools next to him.
Some axes, hammers, and knives were strengthened into Noble Phantasms, which were then thrown at Grand Duke B by Lancelot.
"Hoho, it's really a convenient ability," Grand Duke B praised the handful of Noble Phantasms that came toward him.
Then, using his inherent skill, [Vampirism] or [Shapeshift], he turned himself into fog or countless bats. The figure of Grand Duke B gradually dimmed and blurred, turning into a cloud of black mist.
Whoosh— All the Noble Phantasms thrown by Lancelot penetrated through the black fog.
BOOM!
The wall behind the black mist was smashed open. The whole house shook, the walls cracked, and the building collapsed.
Matou Kariya, who hadn't run far, heard the 'boom' coming from behind. He turned his head and was shocked to find Angra Mainyu closely following him. He couldn't help but quicken his pace. He now regretted why he didn't learn magecraft. That way, he wouldn't have to run away in embarrassment and could fight against other Masters.
But now regret was useless; all Matou Kariya could do was run. He couldn't die; Sakura was still waiting for him to save her, and Aoi still needed his protection.
Seeing the approaching Angra Mainyu, Matou Kariya couldn't help roaring inwardly.
Run, damn it! Matou Kariya wished he had more legs.
In the dark, narrow alley, Matou Kariya fled at full speed. Looking at the light ahead, he saw the exit to the main street. As he got closer to the exit, he couldn't help but feel joy in his heart. As long as he reached the street, he would be safe.
SWISH.
Angra Mainyu appeared in front of Matou Kariya and blocked the exit. Matou Kariya stopped, his body trembling.
Why... obviously, it was so close, Matou Kariya roared inwardly.
Angra Mainyu smiled evilly, and black mud surged out from behind him. Matou Kariya looked at the pitch-black mud; fear continued to spread, and his feet shook.
"Move! Why won't you move!" Matou Kariya couldn't move at all, as if he didn't even have the courage to escape.
"No! I can't die yet! Aoi, Sakura, Rin... they are still waiting for me," Matou Kariya roared. While the black mud continued to spread, Matou Kariya could only watch as he was covered by it.
Matou Kariya's eyes darkened, and he fell.
Matou Kariya's expression changed afterward. Angra Mainyu smiled when he saw that Kariya was immersed in the fantasy of 'All the World's Evil.'
"Come on, join me."
In his fantasy, Matou Kariya saw himself put on a suit and marry his beloved Aoi. She gave birth to two daughters, one named Sakura and one named Rin. It was a happy and warm scene.
Suddenly, the screen turned. He saw his beloved Aoi hugging a man with a mustache. His two daughters also abandoned him. Just when he thought it was over, Matou Kariya appeared in the familiar dark basement. He looked up, saw the dense insects, and realized this was the basement of the Matou family. At the same time, he saw Matou Zouken next to him.
A weird smile leaked from Matou Zouken's disgusting face as he said to Matou Kariya: "Your wife is awesome; those bugs are crawling all over her body. The sound of her struggling and begging is really nice."
"And your little daughter, Sakura—that broken look is really something, Kariya."
"Come and see. Look over there. Now, they don't cry anymore."Matou Kariya looked at the scene trembling. He saw Aoi and Sakura lying motionless in the pile of insects, their eyes having lost their luster, allowing the insects to crawl all over them.
Matou Kariya burst into tears and clutched his head.
"No! This is not true!"
In the end, Matou Kariya's eyes became empty. He woke up from the nightmare with a hint of madness. Angra Mainyu laughed when he looked at Matou Kariya, who had been transformed successfully.
"Come on, let's change this world."
"Ah... let me protect you this time, Aoi," Matou Kariya's eyes flashed frantically.
When the silently guarded knight turns into the demon king who kidnaps the princess, Matou Kariya's corruption was born.
"Come back, Berserker," Matou Kariya (controlled by Angra Mainyu) said. The two recalled their Servants at the same time.
"I will take you to meet our mates. Let's make this Holy Grail War more fun," Angra Mainyu said with a grin.
The two then left. However, not long after they departed, a petite figure appeared.
"Ah, have they left?" The figure spoke in a weak voice.
Under the moonlight, the figure gradually revealed itself. A girl with short blond hair, a flawless white face like a doll, and a pair of blue eyes appeared.