It is the October Midmonth Donation Pet and can be found in the Donation Shop.
Egg
The shell of this egg is sometimes rock hard.
Hatchlings Dimorphism (female left and male right)
Adults Dimorphism (female left and male right)
Spoiler
Gargoyle hatchlings love having fun on rooftops, skipping stones, and playing together. They consider rocks of all shapes and sizes to be their friends, and more often than not, the hatchlings will each adopt a rock they will carry with them at all times. While this might be seen as a silly game, the hatchlings learn many lessons by caring for their adopted rocks. The pied gargoyles act like the rocks are their children - they bring the rocks food, take them along on trips wherever they go, and hide them when bad weather comes. If it happens for a hatchling to misplace their beloved pet rock, they will form search parties and spend as long as it takes to find it. As time passes and the pied gargoyles grow, they become excellent parents, creating nearly perfect families.
Spoiler
Motionless statues can be spotted on rooftops, silently guarding the buildings. These statues are, in fact, pied gargoyles. They turn to stone when they sleep and thus can be mistaken for statues. However, even when awake, they can be just as motionless, safely guarding the buildings and those who live inside them. As bulky and heavy as these creatures are, they can fly without issue and like to do so when the nights are moonless. Frightened farmers complain about monsters hiding in the dark and often ask magi to keep an eye on their gargoyles. Even if the creatures are harmless to the farmers and their crops, people still associate them with devils as the gargoyles are more active in the autumn months, when the festivities approach. Instead of causing harm, the gargoyles patrol the skies, assuring no evil falls upon anyone.
Spoiler
The existence of the gargoyles has been a myth for centuries. Faded drawings on old ruins have been dated decades before the mage wars. In fact, the gargoyle is thought to be one of the oldest magical creatures in the world. The pied gargoyle is a descendant of the mythical creature, smaller in size and not as frightening as the one described in legends. This gargoyle has an easygoing personality, and despite its looks and bulkiness, it is a kind creature with a soft heart. Its magic is limited to itself, turning into stone whenever it sleeps. It cannot use this power over other beings, which can be inconvenient in many cases. Even so, the pied gargoyle is loyal, many relying on it to guard their homesteads. It prefers to spend its time outside, uncaring about the weather. Heavy storms or harsh winters do nothing to this creature, nor do extreme heat or hail. The pied gargoyle can sleep for as long as the bad weather lasts, the creature's stone form withstanding everything.
Sprites: Mysfytt
Description: Real
***Thank you for the help, Hitsugaya!***
I have to get one! 
They're like kinda creepy but still very cute Frenchies!
Getting them on halloween for sure.
