"Boom", the ground trembled violently, as if the sound of huge buildings collapsed spread throughout the internal space of the sewer, and more than once, but twice, the second time was even far more violent than the first time.

"Well, it must be painful." Vivian grimaced, but did not stop running away.

"What did you do?" Catherine ran and rubbed the position of her chest ribs. Although the explosion just now did not cause much damage to her, the strong impact still caused cracks in her ribs. Although, with the physical fitness of a professional, this injury will not affect normal activities and combat, it will still be very uncomfortable. However, the current situation does not allow Catherine to properly handle the wounds, and she can only endure the faint pain to act.

"I saw that it was so enthusiastic about us, so I gave him a gift." Vivian smiled sinisterly while running, gritting her teeth and said, "I just added a layer of ice on the ground and then added a layer of spiral force to the ice surface. As for whether it will slip because of its too much weight when it is stepped on, it is not my problem."

"But why are there two sounds?" Catherine asked in confusion: "And the second sound is obviously more terrifying than the first sound."

"Well, the ice surface is slanted." Vivian's eyes floated into the sky and said as if nothing had happened: "It fell down, I really hope it could just be killed."

"The possibility is not high." Catherine listened intently and shook her head and said, "I started chasing again, and I caught up directly along the canal below. Uh, will it not be able to climb up?"

"I really hope it can't climb up, but unfortunately, this kind of war puppet's climbing ability is also very good." Vivian sighed and said regretfully: "Let's speed up, elemental power of wind."

With Vivian's staff swung, a light breeze blew across the four people's bodies. The maid sisters who had never felt Vivian's magic increase suddenly felt that their bodies had become much lighter. They didn't have time to retract their power when they ran, and they used normal power according to their original habits. Then they rushed forward. If Catherine hadn't been prepared and pulled it, they probably would have lie on the ground.

"Adjust your strength and you will be able to adapt quickly. Just just throw away the weight on your body and run normally." Catherine said instructing: "This will make running easier. You will fall in love with this feeling immediately. However, the sequelae is that after the effect disappears, you will probably have the illusion of heavier body because you don't have the help of the power of wind, and you will be very disappointed at that time."

"Thank you, I won't give up on us at this time." Pansy smiled gratefully but puzzled. The two sisters who grew up in the City of Innocence could not understand this kind of unreasonable assistance. In their opinion, it is normal for everyone to be responsible for their own safety in this case. Even if someone still has the spare energy, they should retain this spare energy to deal with other crises that may occur, rather than helping two burdens who are basically ineffective.

"Don't think about it, you are very useful." Catherine seemed to be able to guess what the two sisters were thinking, and smiled gently: "You still remember the route you have along, and you will be the one who will lead the way when you go out."

The maid sisters didn't say anything else, they knew very well. With the real-time map and existing paper map, as well as the magic marks set up by Vivian when he came down and the sensor Anne, the two adventurers were not likely to get lost in the sewer. Catherine's words were just to give them a kind and comfort. Since that's the case, the best reward was to do their best to cooperate and not cause more trouble for the adventurers.

"Swoosh", the sound of air tearing sounded again. Catherine didn't have time to think about it, and her body turned while running. The shield was standing behind her, her shoulders were pressed tightly against the back of the shield. She didn't even have time to use her skills to hold her position to increase her defense and stability, and she only had time to open the barrier of the legion barrier. Then she ushered in the impact of the second explosion. With the light and explosion, Catherine flew out again, flew over the top of the heads of the three girls, farther away than last time. She flew more than forty meters before she fell heavily to the ground. It was not until Vivian and the other two were about to run to her side that she barely shook their heads and crawled up.

"Damn it, another four thousand gold coins." Catherine obviously had ignored the information about the value of this crystal mentioned by Vivian before. She was completely using gold coins to convert the attack equivalent of the puppet, rubbed her shoulders and chased behind the three of them, and said in pain and despair: "Vivian, tell me quickly how many gold coins it has."

"Sorry, it has no gold coins." Vivian stared at Catherine with his eyes squinted: "If you refer to the crystal explosion bomb, the maximum carrying capacity in the record is eight, but in most cases the standard carrying capacity is only four."

"That is to say, I have to fly twice at least?" Catherine smiled bitterly and reached out to Vivian and said, "Give me a bottle of advanced healing potion that I take on internally. The impact is greater than expected. If I resist four times, I will probably have to break a few bones. It should not be so miserable to treat it now."

Vivian was stunned. The advanced healing potion was indeed very effective, but the price was very expensive. The materials alone cost 800 to 1,000 gold coins. The finished products sold on the market often cost about 2,000 gold coins, and the supply was in short supply. For this kind of potion that Catherine thought was a high-end luxury product, it was even more painful to let Catherine drink it than kill her. Unexpectedly, Catherine took the initiative to use it at this time. It can be seen that although Catherine did not show any nervousness, she was obviously not optimistic about the situation. Vivian sighed, took out the bright red potion and handed it over, and whispered: "I'll take it next time."

"Stop making trouble. If you encounter the undead later, you will have to make a way forward." Although his heartache eyes turned red, Catherine still poured the potion worth thousands of gold coins in one mouthful, and reluctantly put the bottle in her pocket: "I want to take it back as a souvenir, this is so memorable."

"Sisters, be careful." Annie suddenly poked her head out again: "The undead in front may sense you and are moving here."

"So fast?" Catherine looked back at the giant puppet that was turning out at the corner three hundred meters away, gritted her teeth and said, "Vivian, you are in front of me and I are behind you, rush over as soon as possible."

"I understand." Vivian suddenly stopped while running, and the staff paused heavily on the ground, and countless light spots condensed towards the top of the staff. The light spots gathered more and more, and the colors were different. Soon, a colorful magic bead with constant changes in color was formed, floating in the air at the top of the staff. Vivian let out a breath, held the magic bead with his left hand, and caught up with the three people in front again, and said with a little breath: "Sisters of Flowers and Grass, you two try to maintain speed later. I will try to protect you two as much as possible, but if there are too many undeads, it will be difficult for me to guarantee anything, so you two should pay attention to it yourself. But that's the same sentence..."

"Don't leave you." Mimosa took the initiative to continue, "Don't worry, we will never cause trouble for you."

"Vivian, will you be angry if you want to name someone just before?" Although the situation was urgent, Catherine still joked with joy in pain: "Why do you call me that too?"

"Hey, sister, I find you are becoming more and more like Panis." Vivian immediately fought back: "You haven't learned to joke in this situation half a year ago to adjust the atmosphere."

"Well, because I found it really works." Catherine was stunned and said a little embarrassedly: "Of course you have to learn good things and use them yourself."

"Where is that bad thing?" Vivian asked.

"Of course, it's chopping him to death." Catherine waved the shield in her hand, just like the actions she made during her routine pursuit every day: "Never show mercy."

"Hahahaha." The crisp laughter of the two girls made the maid sisters sincerely admire them. The two sisters who have been following them naturally knew that the current situation was not optimistic. The huge and hideous metal puppet behind them was like a gradually approaching God of Death. If it was allowed to get close, it could easily trample all people to death, which was a real sense of trample death. Although the undead in front of them had not seen, or the two sisters had never seen the undead, from various legends, the pale skeletons, ethereal ghosts, and terrifying death knights, each of them was creepy. If it weren't for the existence of two adventurers who could talk and laugh as usual in difficulties as the pillars of their hearts, the two maids would have been mentally broken.

"Come on, look at me." Vivian shouted loudly. There are many corners in the sewer, which often block the sight, but these corners cannot block the sound. Although they cannot see it, everyone has heard waves of heart-pounding sounds when bones rub and collision, and at the same time, they also heard waves of soul whispers that seem to be close to their ears. This is a symbol of a large number of skeletons and ghosts.

"I really don't understand why there are so many skeletons here." Although Catherine's attention was all focused on the metal puppet behind her and gave Vivian the attack mission in full trust in the front, she couldn't help but ask: "Skeletons can only appear with a large number of remains. This is a sewer, not a cemetery, where does it come from? Moreover, it has been closed for thousands of years, so how could there be so many bones? This is not common sense."

"Even if you ask me, I can't give you an answer, sister." Vivian said helplessly: "But you will know the reason soon, elemental, triple-explosion technique."

A huge fireball with a diameter of more than half a meter was formed at the top of the staff. Unlike the explosive flames that were thrown out when playing with Pannis or Lina, this time the flames inside the explosive flames condensed into a light blue due to the high temperature, but even if they were very close, they could not feel any heat at all. Obviously, all the temperature and power were bound in the explosive flames.
Chapter completed!