While the monster flinched, Meryl fired three arrows instantly at the left eye of the monster. They assumed that the damage output of those would be enough to kill the monster, but they failed for some reason. She used her zombie dragon and made it use Fire Breath, but that didn't help much those beasts had Fire Immunity level seven hundred, after all. Still, they finished the creature when it emerged the next time. Still, they would need more to make their combination more powerful. Billy could think of a few methods, but it wouldn't help much telling them.

"Make it fly as fast as you can," Billy said to Meryl while he was controlling his drones even faster.

Meryl nodded. In such an environment, they couldn't afford to build their strength slowly, they had to first find a place that could be defended and then use it as a base before anything else, and the best place would be the spot between floors.

Fortunately, the speed of a zombie dragon wasn't something to laugh at, so they managed to cover a lot of distance between battles. Still, since that floor was so massive, they could only imagine for how long they would have to fight until they found the spot.

"I am starting to think that this place was developed to be an impossible dungeon to clear," Icarus said. "Even with our powers, someone could only last here for so long."

"Meryl said that the maker discovered this place once he got the powers of the other five reincarnated individuals," Billy said. "So, we can assume that the dungeon only appeared two or three years ago, when the conditions for it to be possible to clear had been fulfilled."

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"So, this isn't a place that one of us can clear with only our original innate skills?" Lucyna asked.

"It seems so," Billy replied.

"I still find it weird how come a dungeon can suddenly begin to work like that?" Lucyna asked. "There are places or monsters that work like that as well?"

"The titans more or less worked like that," Billy replied. "They absorbed enough mana to become that strong and to destroy a state. After that, they went to sleep and only woke up when they had enough energy again. Until now, I assumed that some dungeons appeared to make things move in this world, but the dungeon cores are pretty suspicious as well. It wouldn't surprise me if they can only remain active when the mana level of this world is high."

They didn't get everything, but the others could understand the basics. All in all, dungeon cores needed mana from the environment to be able to do anything, and some were so powerful that could be active when the world was filled with mana. All of them knew that their actions were altering the world, but that wasn't something that they had to worry because it was clear that their existence was meant to bring changes.

"So, do you think that the cores are some sort of natural mechanism of this world?" Icarus asked. "They can be useful for the economies of this world, but they can be problems too. This dungeon is a fine example of that. Leave it alone for too long, and then dragons will increase in number and rampage around the world."

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"Storms can be a problem as well," Billy said. "What would happen if we didn't have storms? Thunderstorms help transfer the negative charges back to Earth, lightning is generally negatively charged. Without thunderstorms and lightning, the earth-atmosphere electrical balance would disappear in five minutes."

"... Where did you learn that kind of stuff?" Icarus said.

"I had a lot of free time as a teen back on Earth," Billy shrugged. "Anyway, it is evident that there are things in all worlds that are problematic, but they exist for a reason, a good reason. I assume the dungeon cores are like that, we just don't know the specifics yet."

Putting that aside, Billy wondered what would happen in such a place if they tried to ignore the spawned monsters. They tried that, but eventually, they saw five Wyverns flying behind them. They couldn't chase them through the magma, but they could do so while flying.

"This is good, keep the dragon flying since their speed is the same; we won't have to worry about them hiding under the lave," Billy said.

Meryl had a hard time aiming since she had to control the zombie dragon and prevent it from smashing them against the walls around, but in the end, she pulled that off.

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When the first monster fell, the others began to spam Lava spears, so Billy worked on blocking them since the others were attacking pretty fast. Focusing on defense wasn't his style, but it was the most efficient thing he could do at the moment.

"I can't use Acceleration Manipulation, but this is fine. I will be able to rest my mind for the next training session," Billy thought.

Despite its size, the zombie wyvern could fly pretty fast. Around two hundred meters per second. Perhaps, the monster could be even faster, but that would be risky inside a dungeon. Despite that, they had to fly for two hours to find a place where they could stop. The floor, the entire dungeon was stupidity massive. At that point in time, it was evident that such a dungeon was the biggest and hardest in the entire world.

After they found a spot to rest, they worked together to kill another wyvern, and Billy moved the creature to that spot with Telekinesis. It was finally time to analyze the monsters down to a medical level

"Ouch, their scales burn, so don't touch them," Billy said.

"My bad" Icarus said.

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Billy was protecting them until now, so those three got silent while they were working. Since the beast lived under the magma, its scales could absorb a lot of heat They could make good defensive gear, but right now, they were interested in other parts.