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Ensuring my own safety was not, in fact, all that difficult. The tower I had created around us was good enough already to protect from wild animals, which was all that was around. I was actually
already safe.
But I could be
safer, and more to the point, the process of making me safer would assist with the other two goals I had.
So, I started digging. In the tower I had made, I made a set of stairs leading downwards, and then kept going. Dirt and rock vanished as I absorbed it, adding, however minutely, to my supply. A goodly chunk of that income went straight back out in the form of thick, strong walls so that I didn't have to worry about the ground collapsing, however.
Once it had gone down ten meters, I started with the basics. A maze.
A lot of long tunnels were dug out, somewhat cramped, but wide enough for my companion to fit through. I couldn't make them too small, lest I restrict the mana flow too much, but I could definitely make it confusing and winding very easily.
So I did.
I started with a central, roughly square room. I went through the effort to make it look somewhat natural, but both the ceiling and floor were flat. Four holes in the walls lead out to tunnels, each of which split off into multiple directions more or less immediately. Some lead to larger caverns, while others lead to yet more tunnels. All, however, were winding, confusing, and not at all easy to navigate. Most of them lead to dead ends, though I did scatter a few fake walls here and there which lead to other rooms.
I was actually somehow proud of the fake walls. They were made of a thin, porous material with an equally thin layer of rock over them. They looked and felt like another other part of the wall, but their thinness meant that they didn't impede mana flow very much.
The entrance into the room in which I was hiding was behind a fake wall, leading to a particularly large and smooth cavern. On the wall off that cavern was a magically reinforced door. Through that door was me.
What was the point of all these random caverns all over the place?
Well, the point was farming.
There was, of course, only a single way I could get more soulstuff. I had to absorb souls from other sources, then process those souls into raw soulstuff.
A problem then immediately arose in the form of 'what if I ran out of sources for souls'.
The solution was simple: 'create more sources'. I couldn't run out of sources so long as I could make more sources. The problem in
that, however, was equally simple.
I needed soulstuff in order to make souls.
Mana was easy. With a single exception, it could be transformed into anything and be transformed
from anything.
That exception, of course, was souls. The only thing that could be made into souls was raw soulstuff. No ifs, ands, ors, or buts.
Spending soulstuff in order to make souls to absorb soulstuff would therefore seem counterintuitive.
The trick, of course, was simple. Souls could grow stronger, more powerful, and bigger. In turn, I would get more soulstuff from harvesting those stronger souls than I would from weaker souls.
The cycle was equally simple. Use soulstuff to create souls, let them get stronger, and then harvest them once they are. Rinse and repeat, now with more raw soulstuff to make more/stronger souls.
How, then, did a soul grow stronger?
Primarily, two ways. The first was by living. A soul grew stronger as it got older. Not by much, admittedly, but the growth was there.
Also under the aegis of living was experiencing things. Souls developed in response to experiences. Seeing, hearing, experiencing new things, acquiring new knowledge, it was all something that made souls get stronger, and faster than simple aging, to boot.
Under that same experience was communication. Interacting with other souls also lead to development. They played off of each other. Interaction was another form of experience, usually somewhat different every time.
Another thing under the aegis of living was training. Physical, mental, magical all increased the strength of the soul. It was, in the case of the first two, the effort put into it and what was learned respectively that did most of the work, but for magical training, it was slightly different.
Almost all kinds of magic requires mana to utilize. In the vast majority of those cases, that mana was going to be coming from the person using the magic.
Souls were the source of mana. Simply by existing, souls produced mana, endlessly, naturally, and almost unstoppably. Raw soulstuff was no different.
Souls were also typically the place where mana was
stored. Some of it leaked into the body and was stored there, but souls held the majority of it.
Using magic, then, depleted that storage of mana. Taking mana from the soul was an act that caused a small amount of strain. The more mana you used, the greater the strain. As the soul was the source of life and seat of consciousness, this would cause physical and mental exhaustion. Given time, one would recover from the exhaustion just fine.
But the strain placed on the soul?
Well, in this aspect, the soul might be likened to a muscle. When the soul recovered from the strain, it grew stronger. As it did, it would in turn generate more mana, offering faster recovery while also becoming capable of storing even more.
Those were the methods by which a soul would grow stronger in life.
The second way that a soul got stronger was faster, but also more dangerous. The second way was, quite simply, to absorb the souls of other beings and incorporate them into one's own.
It was not as easy as it sounded, obviously. Souls
are not easy to absorb. They are slippery, they tend to wander, and they are very difficult to actually manipulate. The fact that I can do that and process them so easily is, in fact, abnormal. Most things
can't do that.
Gods have trouble doing the kind of soul manipulation I can do.
The most that normal beings can accomplish is to shave off a tiny piece of the soul and absorb it. This is, in some ways, not actually a bad thing. Sure, it limits how fast a soul can grow, but it also limits the other problems of absorbing souls. Souls, as I said, are the source of life and the seat of consciousness. To take a soul into oneself is to take all that the soul
was into oneself, too. Thought, memory, language, power, emotion... all of these are held within the soul.
To take all that into oneself... well. To take a small bit is fine, but the phrase 'too much of a good thing' definitely applies.
Well, regardless, those were the ways that a soul got stronger.
Given all of the above?
My favoured source of souls were social creatures in large numbers, preferably several species that are hostile to each other so that they keep within manageable margins.
On the small scale, that amounted to eusocial insects such as ants, bees, and termites. On the larger, I preferred pack and pride animals.
Considering that I had a winding network of tunnels and caverns to work with?
Definitely the former.
The real trouble is making sure they can survive down here. It was, certainly, possible to have them survive of nothing but ambient mana, but that honestly wasn't very efficient when it came down to it. Every single one would be a direct drain on mana, with a bigger and bigger drain the more of them there were. Considering the fact that they were eusocial insects, their numbers could add up
very quickly. Then you get into the
other problems of that, because while they can survive off of mana, they do still need to respirate, with all the consequences
that entails.
I will note that this is why I go through the effort of making ecosystems. Plants are easy to take care of. Water, good soil, light, air. That's all they need to grow. How convenient that taking care of them also means that they will take care of most problems that will arise with life underground.
The fact that I have none of the four down here is easily solved.
I carve a spot underneath the floor of the entrance. It's actually fairly large, nearly four meters wide and spherical. It doesn't last very long, because as soon as it's done, I create a chunk of crystal to fill the space It's a sphere, as approximately perfect as I can make it. More grooves shortly start appearing on
that, forming circular patterns connected to each other across the surface.
A look over it reveals no flaws, which is good. I gather more mana, and then condense it, transforming it into a solid material. The grooves are filled carefully and patiently.
The moment it's done, I pump a slight amount of mana into it.
I feel the drain immediately. Mana sucked out of the air, sapping straight from my aura.
I let it happen, and if I had had a face, now would be where I would smile.
Though it was hidden under the rock, the fact that it was within my aura gave me awareness that the runic arrays were lighting up as it continued to absorb mana. It doesn't take it very long to reach its maximum capacity. A mere thirty seconds. When it does, its glow changes, and a wave of mana promptly sweeps through the caves in every direction.
Runes, I will note, are easily my favourite school of magic. That runes are also one of the very few ways to automate the casting of magic and usage of mana is not a coincidence.
I had been, a very long time ago now, a programmer. Code was hobby and a study.
In magic, runes were the closest thing I had to code. The moment I knew it existed, I delved into the art with fervour, learning all I could.
It was, perhaps, not the best use of my time I could have. There was nothing that runes could do that I myself couldn't. I was, furthermore, extremely capable when it came to things such as multitasking. I did not
need runes to do things.
By the time I had discovered it, I had been personally managing three thousand, eight hundred, and eleven distinct soul farms. By the time I had completed my study to my satisfaction, all of them had been running on runic arrays.
I was
not eager to do it again. I
could multitask all that, but I could also grind myself into dust. It would be only slightly less pleasant.
The runic orb's glow changed to white. Air began to fill the caves, a perfect match to the atmosphere up on the surface. The moment the pressure had stabilized, the glow changed to a clear blue, and water began to appear in the caverns, pooling in and on the ground throughout the place.
That too finishes quickly, stopping as the orbs detects that the environment now possessed the amount of water defined.
Clear blue gave way to earthly brown, and the ground shimmered in the caverns, a wave of change spreading out from the entrance through to the ends. Fertile soil, just waiting to be used, came into being.
So little effort on my part, and each of the caverns now had an environment almost perfect for growing things. This, of course, was why runes were my favourite.
One array to suck in mana from the environment. One array to scan the environment of the caves. One to break that information into usable pieces. One array to manipulate the air, to keep it within certain parameters, and the accompanying array to describe those parameters. One array to manipulate water, with its own array detailing
how. Two more arrays for the manipulation of earth and detailing exactly
how that earth would be manipulated.
The defining arrays were the largest arrays on the sphere. The air array defined an atmosphere of 78% nitrogen, 21% oxygen, 0.05% carbon dioxide with the remainder being undefined. A variance of five percent for each ratio was allowed before intervention would take place, and the air manipulation array would absorb any extra and replace any deficient. The water array defined water with a certain amount of minerals and nutrients in it. The manipulation array would see to it that that was what was going to be created. Variance, again, was at five percent. The amount of water could drop or increase five percent before intervention took place. The content of the water was also allowed a variance before intervention.
Much the same as water and air, the soil also had the same thing going for it. X dirt with Y minerals and nutrients, Z variance before intervention.
All of this was bound up in one final array. The simplest of the all of them.
A timer.
A timer lasting exactly one hour. Every hour, on the dot, it would trigger the scan array. The scan array would trigger the information checking array. The information checking array would check the collected information against the three defining arrays, and if it found that the air, the water, or the soil were outside of the allowed parameters, it would trigger the appropriate array and reset the appropriate offender.
The array that sucks in mana from the environment was always active. It would keep going until it was full, and the moment there was a drop, it would start right up again.
Efficient? No. Doing it myself would have been better, but I was quite well and tired of that.
Unless something went
dramatically wrong, I would never need to look at this entire place,
ever again.
It was missing only
one thing.
Light.
But, that's easily fixed. I create more crystals, these ones shaped like stalactite, and hang them from the ceilings of the caverns. The runes that I carve into
them are far simpler than the previous. A mana absorbing array, a timer, two definition arrays, and a light manipulation array.
The timer is twelve hours. The first definition array defines sunlight as experienced at midday. The second defines moonlight as experienced during the full moon. The light manipulation array creates light as defined by the definition array. Every twelve hours, the timer array swaps the definition it is using.
One is a control sample. Exactly the same as all the rest, but the timer is five seconds. I flick it on, and daylight bursts through cavern, emanating from the crystal. Five seconds later, the mana shifts, and daylight is instantly replaced with moonlight, no dusk, dawn, morning, or evening to distinguish it. When it changes back five seconds later, I absorb all the mana from it, and then change the timer back to twelve hours.
The next step is actually filing all these caverns up.
Keeping in mind how much mana I was expending for upkeep of the environment, I did not actually have that much soulstuff to spare. I needed to keep enough soulstuff to keep up with the expected mana expenditure, plus a little bit more in case of an emergency. The remainder was... just
barely enough to put plants in all these rooms.
Well, that was fine. It would take the plants a few days to grow enough that putting down a few species of insects wouldn't see either wiped out.
I was going to be running pretty close to the line... but I'll deal with it. It'll start paying off in a few days, anyway.
Time to get to work.