Short Story The origins of the terrarian slimes.

[Godley]

Many know the slime specie as a humble and playful pest, purposelessly hopping around in even the most dangerous places in the world.
But those who truly know their origins looked at them with fearful respect, for the slimes are originally fragments of vile souls broken after being condemned to never ascend to the cosmic heaven above the highest of the high.
their bulb-like appearance is merely a result of the lingering magic near them, naturally collecting moist substances nearby to form a slimy shell that the soul could possess, a meager gift given by The Godly Gatekeeper as a form of pity.
there is one, and only one way to ascend after becoming a slime, and that way is to become 'clear'
this is a very complicated process with several difficult spiritual requirements such as being neutral in engagement of combat, but as it is the only difference between them and those condemned to hell, many, if not all, strived.

this is the history for the majority of them, some of them are much more complicated.
(I will post the individuals as replies).

 

[Godley]

mother slime;
if a mother failed to gave enough care to her child when it was young and caused it to die, or killed the child with evil intentions, then when she die she will instantly become a slime, what's more, she will always bare child, and will always have to take perfect care of them until she becomes clear enough to ascend.

pinky.
if a slime becomes very clear but for various reasons refuse to ascend even when it can and know what it was like, it become a pinky, a small slime of purity and love.
they are very tanky, for they possess the vitality of an ascended soul.

 

[a light switch]

What about toxic sludge?

 

[Godley]

Toxic sludge.
These beings are the result when wraths, the creative but vile beings born from the corruption or the crimson, takes on a physical form in the environment of the underground.

Contrary to what many thought, only the most powerful wrath, which are mostly sealed in the Great Wall Of Flesh, can create the form usually know as ’wrath’ out of pure dark matter, the majority must work with the surrounding solid matter.

wraths can only rearrange and possess the corpses of sentient beings or stuff made out of demonite, The more sentient the corpse, the easier to work with, and the weaker and less dangerous the result.
A Well-known example of the possessed beings are cavern skeletons, from the bones of the fallen.

though wraths were originally created by the great corrupter to make weapons, such as the night’s edge, and armor for the armies of the corruption, when the war ended they remained conscious unlike the others of the army, possibly because they’re not technically part of it, and wanted to overtake the world for themselves.

To do this, they spread far and wide, taking on powerful physical forms with the corpses of other beings along the way to offend off, and invade, other sentient beings.

Slimes are little more than crude beasts, and are therefore quite strong when possessed, but as slimes are hold in one place by little more than pure magic, they rot incredible quickly and must be killed freshly in order to possess.
However, overworld slimes does not dare venture out at night, and therefore can’t be attacked by the wraths, who can’t touch sunlight.
cavern slimes, on the other hand, are not so lucky.
this is why the toxic sludge were so wide-spread and common in the cavern, but nowhere else.