After dealing with the monsters that reappeared, Ronald and Lilu moved on.

This walk was longer than the previous dive.

After walking for a full kilometer and disposing of the monsters several times, they noticed that the arc of the 'ground' began to rise upward.

Lilu, whose detection range is far inferior to Ronald's, immediately asked:

"Ronald, do you feel something?"

Ronald immediately solved the mermaid's puzzles:

"The road ahead of us will go up until it reaches a position about the thickness of a volcanic tube, and we will reach our destination."

At such a distance, even Ronald's perception could not capture the situation there.

It's still thanks to the enhanced effect of [Infinite Negative Field] on spells.

He was able to use the cooperation of his multiple spells to detect the magic fluctuations that existed there.

After another long time, Ronald and Lilu finally arrived at this destination.

That's right here.

The secret of the birth of the lava monster is revealed to them.

In this sufficiently wide tunnel, an unknown force gathers the lava in the center, quickly forming a red, hot core. When this core reaches a certain level, it will actively leave its original position, and then automatically absorb the surrounding lava, thus evolving into a completely different monster.

Sensing the changes ahead, Lilu asked Ronald directly:

"Ronald, are we going to destroy this place? Stop these monsters from continuing to appear? ”

"I'm afraid not." Ronald shook his head and denied, "In the entire lava lake, this is the only place where there are magic fluctuations. If we want to keep up with Caterina and the others, we have to understand the situation here. ”

Ronald's idea is simple –

These lava monsters, while dangerous, are definitely no match for Katarina.

Since Caterina entered the lava lake first, she will be able to solve this problem when she arrives.

Now it remains in its place, undamaged.

It's just that this thing that gave birth to a monster has some kind of reason why it can't be destroyed.

Ronald expressed his idea, and Lilu agreed.

So the two of them casually destroyed the newly-born lava core, and then approached the past, ready to study the secrets of this place.

At the entrance to this tunnel-like site, the lava flows smoothly in a swirling trajectory, and the magic fluctuations that Ronald noticed are surrounding the surrounding walls.

Lilu, who is more sensitive to lava flows, naturally chooses to ponder on swirling magma; And Ronald, who is more precise in sensing magic, naturally studied it on the surrounding walls.

– The situation here is unique.

Under Ronald's observation, the magic fluctuations here were not too hidden, just embedded in the inner side of the surrounding walls, a depth that would not be directly scorched by the lava.

And the details of these magics......

There are no runes, no special details, pure flow of magic.

However, even with such simple structures, their very existence seems to contain some kind of information to support the changes they cause in the lava here.

“……”

Ronald was a little at a loss, so he simply cast a spell to target the original sin of greed.

- Name: Shaped Tunnel Magic Ring

- Function: Condense and shape the fire element, tearing apart the isolation between spatial boundaries.

- Status: Stable condensation of fire elemental creatures, supporting [micro/small size creatures] to cross the boundary cableway, and it is expected to support medium-sized creatures to cross after twelve days.

“……”

That's where spells come in.

What might have required Ronald to bother to research, and might not even produce results, is now laid out at a glance.

This information is clear.

Ronald also swam directly to the place where the lava core was condensed.

He didn't know how this channel worked, but if he wanted to say that this position played the teleportation function, it must be in the center - after all, the fire element that supports this function is converging there!

"Ronald, the center of this vortex seems to be a little different."

Ronald approached up, and Lilu, who was studying the direction of the lava flow, noticed it and explained her findings in advance:

"According to the normal law of vortex, the lava in the center of the vortex should not stabilize in this state. It must have done something other than condensing these lava cores! ”

He is worthy of being an 'explorer'......

Hearing Lilu's discovery, Ronald couldn't help but sigh in his heart.

She discovered the secret here with the convenience of her spells, but Lilu made a judgment based solely on the accumulation of knowledge. In such a contrast, it is inevitable to have respect.

So, Ronald also spoke:

"Lilu, I've found out that the situation is similar to yours."

"In addition to condensing lava creatures, this place also has the ability to teleport across borders, but now it can only support the passage of miniature and small creatures."

As they spoke, Ronald and Lilu reunited.

Although the two couldn't see each other's expressions, they tacitly sensed one thing - the next journey was definitely completely different from just now!

In this tacit understanding, Ronald waved his hand to shatter and condense a rudimentary lava core, and swam towards the center of the vortex with Lilu.

“……”

When I came here myself, I found that the lava center was surprisingly quiet.

There is no subtle friction caused by the flow here, nor is there the sound of the lava core condensing. Infused with the magic of circulation, it seems to be separated from the surroundings into two completely different worlds.

Such a quiet atmosphere, Ronald subconsciously did not break it.

But the mermaid next to her obviously didn't have such an idea, and Lilu suddenly asked:

"Ronald, I have a question."

"Since this is the place of teleportation, why hasn't the lava core been teleported away?"

“……”

Ronald didn't expect Lilu to speak at this time, he was stunned, and then he guessed himself:

"I think it's probably because the lava core is a product of this teleportation system, right?"

"Just as it doesn't teleport away the matter that sustains the circle itself, the lava core lava is also under such judgment conditions, so it will naturally avoid being ......."

"Hmm!"

"We're going in!"

Lilu and Ronald exclaimed at the same time.

Because just as Ronald was explaining in earnest, they suddenly felt their bodies lean forward.

This is followed by moments when the body is out of control.

The unchanged orange-red color of lava in front of them finally faded from their sight, and their keen perception improved a lot after the change in the environment.

—next to the two.

- Darkness and sporadic light descended at the same time.

In a new environment, the mermaid Lilu first couldn't help but ask:

"It's ...... Secret realm? ”