A long time ago ...

Inside the Dungeon ...

There exists a severed giant black hand ...

A black hand from who knows where it came from, as the severed giant black hand then stands inside the Dungeon.

For years, the Giant Black Hand had slowly changed into a tree, a black tree that produces black fruits, a pitch-black fruit that contains a black liquid.

As the fruit starts to spread around the tree, the fruit smells first attracted some of the minor beings inside the Dungeons, from insects, birds, and many others as they began to eat the fruit that grows for the first time.

As they eat it, they consume the black liquid as the black liquid then engulfs them from the inside, turning their physique as their body then turns black like a shadow while the creatures slowly transform to their new upgraded form.

As the creatures turn, some of them decided to stay to sate the black fruit while the remaining others decided to go out to the opened Gate as the black creatures rampage on the other monster territories and Dungeons using the Gates as their door.

As it happens, many of the monsters that had regained sentience then discover where did the black creatures come from as suddenly a Gate opens which led them back to the Dungeon where the Black Tree resides.

When the monster sees it, they were immediately attracted by the black fruit's smell, which they then eat with joy as the black liquid inside it slowly engulfs them too, transforming them into a more advanced form.

As they transform, the black liquid transforms and upgrades their physique while changing the color of their bodies into black as those monsters become the beings that we're later called .

Not just that, for some of the Black Shadow monsters the fruit also increases their intelligence, making them sentient monsters as they all gather more numbers and then make them worship the Black Tree, from the ones that already had eaten the black fruit and becomes the to the ones that just went into the Dungeon as they instead take care of the Black Tree.