Goblin

Little demihumans that build villages and live in places such as caves. The art appears to show a child, but this is a mature adult. Their bodies do not grow any bigger than this. Unbefitting of their little bodies, they have the power to lift enormous weapons with ease, they are even a bit clever. However, they are childish on the inside and they have a foolish, simple side. They like mischief and that is what they use their wits for.

They often form groups composed of all goblins, or with a “ Her name is Sarah, she is 19 Mamono mana, often abbreviated MM and alternatively translated as monster's mana, is a kind of "life force" which is possessed by monsters in the Monster Girl Encyclopedia world. The yin-yang analogue of the essence which is possessed by humans and other mortal creatures, mamono mana sustains monsters in a basic, metaphysical sense, as well as powering their magical abilities. It has several powers that essence does not; most obviously its ability to corrupt creatures, environments, and even gods into demonic perversions. Monsters also innately possess, and can store, far larger amounts of energy than humans innately can.

However, its disadvantage is that they release more of the energy from their bodies than humans do, and while this does serve various purposes, it also leads to a lot of energy loss (monsters can be said to be high-performance, low-efficiency beings, a trait common in the higher beings of the MGE world such as gods). This loss is compounded by how, like human women, the monster's ability to recover their energy via internal generation is fairly weak. In the previous era, if a monster's internal reserves were depleted too much, and there was no proper source of ambient energy to absorb (or many humans to consume) they would have to enter a period of prolonged dormancy until their internal energy generation completed its work. This comparative lack of generative ability is one of the reasons that monster girls hunger insatiably for semen: it contains more essence than anything else, so constitutes a feast for their demonic constitutions, and enables rapid recovery or even increase in their maximum mamono mana levels.

When highly concentrated, mamono mana can appear as a physical substance: a black, tarry goo that spontaneously forms into ominous, tendril-trailing spheres. Too much in one place may spawn its own elemental, a dark matter (though the amount required for this is extreme, hence why there are very few dark matter).