After taking the oath, Lancelot was a little uneasy: "Berserker, I am a little uneasy. I always feel that something unfortunate will happen."

Duke shook his head repeatedly: "No, you think too much."

"I hope so, but I still feel something is not right..." Lancelot frowned deeply, looking even more melancholy.

"Alright, we have a big enemy at hand, let's deal with Caster first before we think of anything else!"

"That's true." Lancelot agreed deeply and suppressed the uneasiness in his heart.

The two of them traveled quickly, and under the leadership of Duke, they soon arrived at the underground drainage exit of Fuyuki City. If nothing unexpected happened, Caster and his master Ryunosuke Ameyu were hiding inside.

"Berserker, be careful. Caster's class skill is 'position construction'. An excellent magician can even build an impenetrable temple-level defense." Lancelot got into the role quickly and played the role of the master to perfection.

"No, Caster has no intention of catching us all in one fell swoop. He and his Master have already started to escape." Duke closed his eyes and knew.

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Duke took two weak breaths, waved his hand and said, "No, there is no need for you to expose your Noble Phantasm for some minor characters, Xiaolan. The iron rule of the Holy Grail War is to hide the identity of the Servant, and the Noble Phantasm cannot be easily used until the last moment."

"It's okay, I'm a magician too. I can feel that Caster's level is very low. Creating a magic workshop should be his limit." Regarding the former French marshal, in addition to the big eyes that mutated due to peeking into the abyss, the most impressive thing is the deep sea sea monster he summoned, a tentacle monster with suction cups and fluffy tentacles.

This is not surprising. Although he is a leader among the Knights of the Round Table and has good character, if you delve into the legends related to him, it is not difficult to find that he has many missions of lurking in the enemy. In this Holy Grail War, in terms of acting skills, only Duke can surpass him.

Caster's abilities could not cover such a huge underground palace. The water demons he summoned stood guard near the lair, and only simple magic traps were set up in other areas to guard against intrusion.

"Okay, enough small talk, let's go after Caster!"

"Xiaolan, quickly end the fight and let's chase them."

Lancelot was deeply moved by what he heard and knelt on one knee in front of his horse: "As a servant, I actually made you spend so much energy. It's all because of my lack of strength."

Almost at the same time, Caster also realized that he was locked by magic power. While shouting "Ryunosuke, run, the Whitebeard wizard is coming", he ordered the water demon to attack to cover the two of them to escape.

In the blink of an eye, the underground temple turned into an ice-blue snow castle!

As he walked, Duke sensed a faint magical power in the air. Following the magic traps, he soon came to the edge of Caster's lair. What caught his eye was a dense mass of water demons waving tentacles. The soft-bodied creatures had no bones and were covered with a layer of sticky liquid, which made people feel nauseous.

Hearing Duke's words, Lancelot subconsciously tried to persuade him, but suddenly a magical power that made his heart palpitate spread out, and then a chill that froze his heart jumped over his side. An ice-blue cold light flashed, and endless frost fell along the way. The ground froze, and the water in the air turned into ice particles and fell down. The water demons that kept coming were all turned into ice sculptures.

"This is..." Lancelot was shocked. He knew that his master was an outstanding magician, but now he realized that he still underestimated him. Duke was much stronger than he thought.

Caster watched the battle in the port area with a crystal ball last night. 90% of his attention was focused on Jeanne, whose breasts had shrunk. The remaining 10% was on the shocking moves made by Duke and Archer. He knew that he had no chance of winning against Duke.

"You are right!"

"Berserker, the enemy's number is a bit too large. Please move back and give me some time." Lancelot said in a calm tone, wielding the sword in his hand so tightly that not even a drop of blood splashed on the horse's feet.

Looking at the water demon that kept attacking, Lancelot stood in front of Duke, pulled out a long sword from the belly of the nightmare horse, endowed it with the toughness and sharpness of the treasure, and killed it calmly.

Suddenly, Duke opened his eyes sharply: "Xiaolan, rush over, I found Caster!"

"No, you are the Master now, don't expose yourself easily, let me, as the Servant, lead the way!"

The sharp sword net formed a curtain of death, and swarms of water demons rushed over like waves, but they could never get close to Lancelot, not to mention Duke who was behind Lancelot.

The reinforced concrete structure goes dozens of meters underground and covers most of the city of Fuyuki. Walking inside it feels like being in an underground temple, which makes people feel insignificant.

Duke sat on horseback, and a huge amount of magic power erupted from his body, spreading along the criss-crossing waterways, feeding back surrounding information like a radar.

"Master, Lancelot will definitely take the Holy Grail for you..." Lancelot's throat trembled a little. He was so obsessed with the feeling of being trusted by the monarch. If he had not sworn to serve King Arthur for his whole life, he would have bowed down and become Duke's lackey.

Lancelot was so frightened that he even forgot to hide his identity: "Master, you don't have to do this. If I use my Noble Phantasm, it will be easy to destroy them."

…

This is a supporting role that has a very high guest appearance rate in magic dramas. Sometimes it also appears as the main villain, and has an enviable rivalry with the heroine!

Most importantly, if this dirty blood stains the monarch's shoes, it will be a shame for him as a knight!

The two followed the drainage outlet into the underground drainage system of Fuyuki City. The terrain inside was very complex, with crisscrossing waterways, as dense as a spider web. Fortunately, the drainage system was built to avoid typhoons and rain disasters. There was no black water and garbage flowing, nor any rotten objects that smelled foul.

"Okay, I'll use my treasure now!" Lancelot swung his sword with all his might, and the long sword rolled up a violent wind blade, clearing a large open space in the crowded front.

"Ah, Xiaolan, I have consumed too much mana. I will leave it to you next." Duke looked weak as if he had consumed too much mana and his body was hollowed out. He took out a tube of Coca-Cola from his arms... cough cough, a tube of mana-replenishing potion. After drinking it, his complexion looked much better.

"Thank you for your praise. Lancelot is unworthy of it." Lancelot felt his blood boiling when he heard the words, and his gloomy face looked much better.

As for why he mistook Saber for Jeanne d'Arc, it might be because Caster felt that women were fickle creatures, and that there was nothing wrong with having a new look every day, a little bigger or a little smaller.

"Xiaolan, these are just cannon fodder summoned by Caster. Their purpose is to consume our physical strength." "I see. Caster is not a reckless person. He uses these monsters to consume my physical strength first, and then kills us all in one fell swoop." Lancelot praised.

"Xiaolan, you are wrong again. I have great confidence in your strength. Compared with other servants, you are the best!" Duke said confidently.

"Run away! Why run away?" Lancelot was puzzled. "Although these rabble are vulnerable, they have the advantage in numbers. They should have the upper hand now!"

Lancelot was confident that he could completely resist the tide of water monsters, but there were too many of them. It would take a long time to kill them all without using the treasure. He noticed that the water monster had the ability to heal itself. The severed trunk was constantly growing new tentacles, which was quite disgusting.

Duke stroked his chin and said seriously, "Maybe he was scared after seeing your bravery, Xiaolan."

The underground drainage system of Fuyuki City is very complicated, with countless waterways. After years of construction and development, some areas may not even be found on the design drawings.

Duke vaguely remembered that there was such an underground city in Paris in his previous life, which was larger than Fuyuki City and connected for more than 2,000 kilometers. However, the personal hygiene of the Gallic chickens was really sloppy, and the garbage was directly discharged into the underground sewers, resulting in more rats in the underground drainage system than the population of Parisians.

Well, you can't expect any moral integrity from a group of people who never take a bath and only rely on perfume to maintain their appearance. Facing the army of rats, the Gallic rooster proudly regards rats as a symbol of the sewer, and even built a sewer museum to commemorate their beloved mascot.

The gossip ends here. Because of Duke's magic lock, Caster and his master fled around in the complex underground palace, but they could not escape Duke's pursuit. Caster lacked physical strength. Ryunosuke Uesugi was not even a magician. His physical strength was better than that of ordinary people, but it was also limited. He was exhausted after running for a while. Caste realized that Duke was getting closer and closer, so he had to return to his original nest and prepare to fight with complex magic mechanisms to buy himself a last chance to breathe.

(End of this chapter)