*Notes:

Thanks for reading! Again any tips for improving the story or grammar is welcomed greatly.

Hope you guys enjoy the story.

Chapter 1

Observing the small furry animal that has come into its territory the entity has some interest in the creature. So far the furry animal takes in its surroundings with caution but delves further in. The concentration of mana inside is appealing so the small animal decides to make a nest in the space perhaps instinctively knowing the atmosphere is beneficial towards it.

Years after the entity's first visitor the animals have come and gone leaving signs of habitation throughout. During these years, plant spores invaded the space and taken root in the ground the entity collected. With the concentration of mana in the air, the plants grew much faster than outside. They shed the conservative forms they had in the relatively mana sparse atmosphere outside and grew without abandon.

The only reason the entity has allowed the invasion from outside is because it felt like these new lifeforms might be what it was missing before. However, there still was a nagging feeling of desire for more. The entity found that when things come into its territory and die the energy in their bodies is forever trapped within. This gave even more reason for the entity to want to attract even more life forms to inhabit its space.

As the entity grew larger and collected more and more energy it also became more intelligent. The entity became more self-aware and started to study the life in his "world". His current size at approximately 2 km squared is still growing at increasing speeds. As he became more aware, his sense of the surroundings also increased past his borders. His sense can stretch proportionately to about as much space as he can control. As he can sense up to 2 km away from his body in all directions he learns more about the world he broke into.

At the edge of his vision, he can sense a river flowing with animals swimming inside. Over the years, the entity has learned that the lifeforms outside require water. The entity decides to try to create a water source in his world but isn't quite sure how. The river is too far away for him to directly absorb, so the entity tries to create water.

Water itself, the entity finds, isn't that complex as it is just one of the forms that mana takes after it has been converted into molecules and combined a certain way. Likewise, it finds that it can create more ground for the life forms to inhabit using a similar method to water. Perhaps to the inhabitants of this world, this would be a monumental discovery as currently they can only gather mana that has already formed the elements, instead of creating the actual element itself. The entity thinks nothing of it however and gets to work to try and create more diversity inside its world.

With an added watering hole inside the entity's world, it creates more sustainability for the lifeforms. The plants for instance, which so far were only being supported by the dense ambient mana inside, now thrived even more with the addition of water which is easier for them to absorb. As far as the animals, they moved further into the world as there is now water and food, so they no longer have to leave the confines of their new homes to live.

The entity has also expanded its entrance to invite more lifeforms in. The entrance is now around twenty meters wide and about 10 meters tall, in the side of a large dark red mountain face. The entity cannot see how high or how long the mountain is currently, which just shows the massive size of the formation.

With the renovation of the entrance, it is now large enough to start accommodating larger but more scarce lifeforms in the surroundings. Before, the lifeforms were already attracted to the hole many times over the years by the mana surrounding it, but they couldn't get inside. They tried to dig their way in but the rocks of this mountain were very durable and even more so after they have been infused with concentrated mana over the years.

With the addition of new animals who prey on other animals, the ecosystem inside the entities world is becoming increasingly more complete as time goes by. The entity takes mental notes of the many types of creatures in its world. The first type which was the very first to enter the space is a small furry animal with beady eyes, long ears, long tails and short arms and bodies ranging in colors from white, brown and black. They mainly eat the small bits of plants that are in their reach. When they first entered the world the long-eared animals were perhaps half the size of the current ones. The small furry animals seem to also have more stamina and reproduce at much faster rates after being in his world for a few years.

This lead to the small lifeforms dubbed by the entity as "Labbits" to be the most abundant animal in his world so far. Shortly after the labbits, entered another small life form which followed the labbits in to hunt them. With the labbits increased reproduction, however, they couldn't eat enough to put a dent in the population of labbits.

This second life form was long without fur and instead had hard dark red scales covering their bodies. This color helped them blend into the rocks and dirt of the mountain range outside, but in the new world which was full of green plant life they adapted and became green with a hint of dark red still lingering. Originally these lifeforms now dubbed "Sekans" by the entity had venom to paralyze their prey so they can safely consume them whole. Now, however, they have evolved to have stronger and more corrosive venom. The venom aides digestion so they can consume more with the increase of readily available prey.

As a result, the Sekans grew much larger to about three times their original size. Originally only being around 2 meters length fully grown and about 5 cm girth now they are 6 meters long with 15 cm of girth. The Sekans were the apex predators in this new world for a while until more predators came into the dungeon. At first, the Sekans ate the weaker predators such as a furry life form with sharp teeth which was larger than the labbits.

As the new sharp teeth lifeforms came into the world, they made nests to breed while consuming the plethora of labbits in the dungeon. The added size of the labbits didn't effect the new life form dubbed "Hounds" by the entity much because they were much larger than even the mutated labbits. However even though their size was many times the labbits the hounds still fell prey to the sekans which dominated the area.

After a year, the hounds began to grow larger and stronger. They also became swifter by utilizing the mana in the air to control their vicinity to a degree or "wind" magic. So despite their new large size ranging up to a little over a meter and a half tall and over 3 meters long with their tails they are very nimble. The agile pack hunters who originally had full gray coats of fur now had streaks of green throughout.

As to why these lifeforms all started evolving so rapidly, it would be because of the curious entity watching from above. Normally even with the naturally abundant mana from the entity's world, it would take much longer to have them evolve to such degrees. The entity though, decided to try and infuse mana into these lifeforms to see what would happen. The strong growth and diverse evolutions surprised the entity and he found it fascinating that they could change so much from just a bit of mana. The lifeforms became a sort of entertainment for the entity as he manipulated them from above.

After he opened the entrance up a large myriad of beasts slowly made their way in from furred animals that were much larger than the previous hounds, to animals that can fly in the air. As more animals started to enter the dungeon, the entity decided to emulate the outside world by creating sunlight for his own. His world already had light from the mana infused walls giving a soft glow, but the animals were more suited to a brighter more vibrant light. The plants, however, did adapt to the previous darkness by glowing like a beacon in the dark. The world now had a day cycle but at night, the inside was still much brighter than the nights outside thanks to the walls and plants.

The entity didn't know exactly why the animals gathered inside his world, but he didn't mind. He found it interesting that even though they died to the animals that already evolved, they still gathered inside like lambs to the chopping block. The entity didn't know that while he grows larger, and the more mana from the world he absorbs, that the concentration of mana around the entrance thickens. The animals from miles around will subconsciously gravitate toward it, including a sentient bipedal race of life forms.