'This is why I've asked for you, Luke. We could really use your help.
'I have ......?　Do you need [restoration] skills?
Yeah, technically, that's the application.

　Depictions were added to the drawing on the blackboard.

　At first, a line is drawn on the ceiling of the fourth floor like sticking up some short sticks, and then a strip of figure is drawn parallel to the ceiling as if it is hung on the ceiling.

The light source of the fourth level is the flames and lava in the surrounding area, and unlike the first and second levels, the ceiling does not emit any light or heat. Otherwise, you wouldn't even be able to get close to the bottom edge of the big hole.

　In the past, during the Demon King's War, I was captured by Julia, who had been transformed into a dragon man, and ended up flying through the air on the first level.

　At that time, Garnett, who clung to Julia's tail to save me, was smashed into the ceiling that emitted tremendous heat and light, and was severely burned.

　If the fourth level was the same, it must have been impossible to even use the large hole as a travel path.

''We'll use it to build a suspended aerial passage. Ideally, there should be a walkway for humans to pass through and rails for transporting goods. I don't think either one or the other would have been a problem.

　The adventurers suddenly stirred behind us.

　Alexia's proposal is to extend the aerial passage from the edge of the great hole to the edge of the wall along the ceiling, and then descend to the surface using stairs or an elevator.

　This would certainly reduce the risk of accidental contact with demons, including dragons, to as close to zero as possible.

　If they were to hit the passageway set up at this height, it means that they were taking a path that would send them crashing into the ceiling or walls in the first place, a situation that would normally be impossible.

If we set up a search base near the wall, we can make a safe and direct path through the big hole. I see, this is an interesting idea.

　Theodore, contrary to the adventurers under his command, is listening to the explanation with a calm demeanor and interest.

''But the level of difficulty in construction is quite high, isn't it?''
Yes, well. It's possible to achieve this in a straightforward manner, but to be frank, it takes a lot of time and effort. We don't want to work under the threat of dragons.

　Alexia wrapped the base of the diagram of the aerial passage in a circle while keeping her true feelings to herself.

It's a pain in the ass to drive the foundation into the bedrock of the ceiling and fix it in place. If I didn't use my special skills, I would have to dismantle the scaffolding from the ground one by one," he said.
...... Yeah, I see. That's what I do with my skills, isn't it?

　As expected of a party, I immediately understood Alexia's intentions.

　Alexia also chuckles and continues to explain in detail to the other adventurers, including Theodore and me.

''Yes, that's right. It's the same in principle as the object that Luke-kun made at the request of a curious nobleman, a sword object stuck into a pedestal - the same in principle.
One of the applications of the [restoration] skill, [fusion].

　The usual [synthesis] is the complete melding of two or more substances and joining them together, but by daring to stop it in the middle of the process, it is possible to create a state where two objects are joined together while retaining their original form.

　In short, the case Alexia mentioned is a classic example.

　The seed of the method of creating the sword stuck into the pedestal was that only the part that was stuck in it was [fused] together, and the pedestal and the sword were made into one, while the other parts of the sword retained their original form.

''Normally, drilling a hole in the rock and securing the anchor bolts would be a very large project. But with Luke-kun's [Fusion], it will be surprisingly easy.
All I have to do is drive the prop into the bedrock as I pour my magic power into it.
'There's no need for extensive scaffolding as long as you can reach it. I've heard that Sir Theodore can walk in the air with his skills, so there's no shortage of assistants for him.

　I couldn't help but chuckle at the boldness of treating an A-rank adventurer who is also a high-ranking nobleman as an assistant without hesitation.

　But the person in question, Theodore, is probably the kind of guy who would easily shake his head and undertake the task.

　While imagining Theodore's reaction, I posed another question to Alexia.

'Assuming that's the way to hang the passageway from the ceiling. The current frontline base would be the landing at the bottom end of the spiral passage that runs through the Great Hole. There's still a bit of distance from there to the rim of the Great Hole, and wouldn't it be a challenge to stick a prop up against the ceiling?''
You make a good point. The support pillar is a rather long steel pillar about the size of a spear, and it would be too dangerous to have it handled in midair. So I'll give you a brief explanation of the whole construction procedure.

　Alexia added the wall of the underground space to the diagram up to now, and added the words 'search base construction site' directly below it.

It's not easy to make a passage from the big hole, so we'll reverse the order. First, we'll build a base, then we'll build a tower or something to the ceiling, and then we'll make a passage in the air from there to the big hole.

　The described content is added in turn to the drawings.

　In this case, there is no need to start from an aerial work of acrobatics.

　The base of operations and the means of transportation from the base to the ceiling are both essential, and they are facilities that must be built no matter what the order is.

''Of course, I'd like to borrow Luke's skills here as well.
''It's the same as with the Hollow Bottom Fortress. We'll take apart the equipment we've built on the ground, move it around, hang [repair] on site and instantly assemble it ...... If it's a dangerous place, this one is the best.

　To use a metaphor, it's a method of construction that involves building a model in a large glass bottle, a procedure that is almost like a bottle ship.

　It's a method only I can use at the moment, and it's an achievement I can be proud of.

Yes, that's the way it should be done. The manpower is to be brought down on a conventional rope and the transport of building materials is to be sent to ....... Let's just pop them all out of the edge of the big hole.

　The drawing depicts a deformed human throwing down a building, and laughter abounds among the adventurers and crafty engineers.

　It's a composition that I can't help but laugh when I draw it like that, but it's not entirely wrong in terms of method.

　Because as long as it's based on the premise of making full use of my 【Restoration】, the damage caused by throwing it down can be fixed immediately.

''Well, that's all for the summary. Do you have any questions?

　With that, Alexia smiled confidently as she turned to us.