At first, Alex wanted to destroy the whole labyrinth with his strongest Tailed Beast Bomb. But after investigating the labyrinth, he found out that it has a very big structure, its walls are sturdy, and it can fix all the damages on its structures.
After knowing those things, Alex wasn't sure if he could destroy the whole labyrinth even with the strongest Tailed Beast Bomb he could make now. He might miss whatever it is that creates the monsters inside the labyrinth, so it is not a good strategy.
Furthermore, if he shoots the Tailed Beast Bomb from outside, its impact might not reach the deepest parts. But if he shoots it from deep inside the labyrinth, then he won't have time to get out before it explodes, so he'll get caught in his own attack.
Alex spent the last month investigating and trying different things to destroy the labyrinth and find the thing that creates those monsters. All his attempts failed, but he gets clues and information that give him ideas.
He will try his first idea tonight, right before the monster wave will happen tomorrow. So right now, the number of monsters inside the labyrinth must be very high. Might as well kill those monsters while trying to destroy the whole labyrinth.
Alex is now preparing himself in one of the fortresses. He stays here when he rests and he also leaves Meteor here with the soldiers. Thanks to his presence there during the monster waves, they don't have many casualties lately.
But Alex's goal is to stop the monsters completely so that there won't be any monster waves anymore. So he is still working hard to destroy the labyrinth completely.
Before midnight, Alex goes to the labyrinth to try one of his ideas that seems to have the best chance to succeed. Well, it's never his idea though. As usual, it's Matatabi who makes the ideas, never Alex.
Anyway, Alex transforms into Mini Saiken and stands in front of the labyrinth's entrance, which is just a massive gaping hole on the ground. It's located in the center of the 1st layer, so there are many paths around the entrance.
Alex has tried to use all the paths around the entrance, but that's not important now. What's important is Alex needs to be quick now or thousands of monsters will pour out from all of those paths to attack him who's alone there.
Mini Saiken Alex concentrates his magic power and creates a very big pink magic circle that covers the entire entrance hole. Then from that magic circle, a massive amount of pink gas comes out and enters the labyrinth.
The pink gas spreads inside the labyrinth very quickly and fills every location. It even reaches the ceilings and enters through crevices and gaps that are narrow enough to be unnoticed if people don't look carefully.
Everything that is touched by the pink gas is disintegrating. The walls, the floor, the ceilings, the traps, the monsters. Everything is destroyed because the gas is very corrosive.
Alex can hear the monsters' painful screams echoing inside the labyrinth. They might just be forms made of magic, but those monsters can still feel pain. Those who don't know these monsters will feel pity when hearing their screams, but they sound like good music to Alex's ears.
He keeps pouring the highly corrosive gas into the labyrinth. The gas spreads very quickly, covers much bigger areas including the high places and even enters narrow gaps like the ones where the traps are located.
This is why he uses the gas form for the corrosive substance instead of liquid because the gas form can spread wider and faster than liquid form. It also uses less magic power to create more corrosive gas than liquid.
There is a problem though. Alex doesn't know how much the gas has spread and where they move either. So he can only keep making more corrosive gas until he runs out of magic power while hoping that it has covered every corner of this labyrinth.
Though with his current amount of magic power, it will take hours for Alex to run out of it. He now doesn't need to share the magic power he absorbs from nature and creatures he defeated with the Tailed Beasts because their seals have been broken.
So he can use all the magic power he absorbs for himself. Of course, he can't use all the magic power he absorbs because he doesn't have an unlimited magic power container. But he can grow that container faster with more magic power he absorbs which will increase his capacity too.
His magic power capacity grows twice faster than when he needed to share it with the Tailed Beasts to break their seals. It already grew very fast even when he needed to share it, so now his magic power capacity grows incredibly fast compared to other Mages.
Furthermore, he now has Kurama who can help him gather magic power from nature when he needs more magic power than his reserve. So he won't run out of magic power too quickly unless he keeps using powerful spells that deplete his magic power rapidly.
But Saiken's corrosive gas doesn't consume too much magic power. Kurama can gather magic power faster than the amount that Alex spends for the corrosive gas even when he uses maximum power that releases as much gas as possible.
That means he can keep going forever because he won't run out of magic power with Kurama supplying more magic power to him than what he spends. This is the main reason why Matatabi made this strategy.
So the only problem now is time because he doesn't know how long it will take to fill this whole labyrinth with the corrosive gas. The good thing is, gas can enter even the smallest gap, so he can be sure that the corrosive gas can destroy whatever it is that creates the monsters even if it's hidden well.
Now, Alex only needs patience. He stays in front of the entrance, supplying magic power to his spell. It will be very boring if he isn't with the Tailed Beasts because he will be all alone for 3 whole days.
Yes, it takes a full week for Alex to fully fill the labyrinth with corrosive gas. Other Mages would have run out of magic power for using a spell nonstop even for a whole day. Even Gildarts will run dry if he keeps using magic for a whole day.
But Alex doesn't have that problem because Kurama can gather more magic power for him than what he spends. He only needs physical stamina to stay awake for 7 whole days. So it's a good thing that he has a very strong physical body and he also has prepared a lot of food and drinks.
7 whole days. A full week is needed for gas to fully fill the whole labyrinth. It really shows how massive this labyrinth is, so it's no wonder that this labyrinth can't be cleared even after 69 years. After all, the corrosive gas can spread very quickly, yet it still takes a week to fully fill the labyrinth.
Normal explorations might take months or years because people need to find the correct ways and the labyrinth also changes daily. Furthermore, people need to rest, eat, drink, and fight the monsters, making it almost impossible to clear this labyrinth normally.
But how does Alex know that he has filled the whole labyrinth with Saiken's corrosive gas? The answer is because the whole labyrinth collapses after a week. That means the corrosive gas has reached the deepest part and disintegrated everything that holds this labyrinth.
Doesn't matter whether it's devices, spells, or even living beings that keep this labyrinth standing and creating those dangerous monsters. Whatever they are, the corrosive gas has destroyed them all.
Basically, Alex has destroyed the mechanisms that keep supplying magic power to the labyrinth to self-heal and change its structures daily. He also destroys the mechanisms that keep creating the monsters.
With all those mechanisms destroyed, the labyrinth can't support itself anymore. His corrosive gas destroys the walls that can't self-heal anymore, making the whole labyrinth collapse.
Alex who stays on top of the collapsed labyrinth falls along with the ground around him. The labyrinth is so wide that a very large area sinks when it collapses and it's so deep that Alex feels like he falls into the center of the Earth.
He quickly transforms into Mini Chomei and flies because he will die if he keeps falling. But he still needs to investigate the bottom of this incredibly deep gaping hole that's even wider than the whole Magnolia.
Alex needs to make sure that he has really cleared his job and he's glad he checks the bottom because he finds something that surprises him on the bottom.
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Ch. 151. The Annoying Council