(Another updated old piece, largely inspired by grimoire girls from Demonbane)
Golem Family Magical Material type
Habitat: Unknown
Disposition: Various
Diet: Men's spirit energy
An extremely rare type of golem monster. From their appearance, a grimoire golem seem to be a little girl carrying magic tome. However, the girl is actually materialized from the tome's immense megical energy. Depend on the tome's energy, the grimoire may appear as just as an untouchable ghostly image, but since the grimoires are usually created with purpose to move the tome around and lets it interact with outside world, more often than not that they will have solid bodies similar to golems.
There are only few magic tomes in this world that have become sentient and thus capable of storing and utilize magical energy to creat the grimoire. Only original tomes, hand writen by their authors, are known to gain life in this way. It is said that "as the authors writing each word, they also recording their thought into the tome at same time". It took years for the said thought, shrouding in large volume of arcane knowledge, to be fused with magic energy and become "life". The first living tome said to become sentient since the time of previous Demon Lords, but it wasn't until current Demon Lord's era that they start creating grimoire golem.
One can say that the grimoire golems are "interface" of the magic tomes. They're linked to the tomes via magic energy, through the golem, a magic tome can moving around and gain sense like that of human (albeit usually better, the golem often has enhanced senses, night vision is just the popular trait), allow it to interact with the world.
A grimoire golem can use every spell writen in her tome. As a magic tomes have very limited way to collect magical energy, just creat one grimoire golem can cost as much as years worth of mana, and thus the golem are alway materialized in shape of little girl to preserve energy. Once the golem is completed, however, the grimoire will be very effective at collecting energy with sexual intercourse. Though the magic tome is still limit to link with single golem, it can rematerialize her to fit any men's fancy.
Those common traits aside, grimoire golems are highly invidual beings, just like how each magic tomes are differrent. Some are cheerful, while other are gloomy and vicious. They often seek a man as master in exchange of spirit energy, but there appear to be no standard in this regard. While some enjoy serving already powerful wizard, other will be more comfortable with master who has little arcane knowledge. Depend on the tome, the man may has devote magic using golem who can go at great length to fufil his ambition, or a selfish girl who abuse him with magic power.
Just like any monster girls, the golems are capable of reproduction. Unique to them, a child of grimoire golem is not golem, but a majin who born with a blank notebook. The mother will fill-in her arcane knowledge in the notebook, making derivative version of themselves. Unlike the mother, majin does not depend on the notebook, although she still has link to its recorded lore. Because of this, their children usually are child prodigy among the witches, and the Sabbath alway seek to recuit grimoire whenever they heard about one.