Stayers are the defenders of Wizardry - Great Magics.
The Stayers are the first of what some scholars call Magichena, magically animated things that are “alive”. Unlike many things, they know their history. The Stayers started existance as Guardian Statues, protecting the home of The Last Archwizard. They are of the classic Gargoyle mold, winged deformed humanoids. In an attempt to improve upon the basic guardian statue, the Archwizard gave them the ability to actually cast spells, so they could fly and project magic missiles. The first saw him create the second, those two saw him create the third, until all five original Stayers had been made.
The Stayers were somewhat intelligent and helpful. In addition to being powerful guardian statues, they became assistants… first of the tote and carry kind, but eventually doing a number of mundane and wizardly things for the ArchWizard.
They protected the ArchWizard and his library for nearly two centuries, until his death. The Stayers realized they would continue to protect the ArchWizard and the powerful magics his library contained. It was more than it was just what they were created for, it was their duty. The world could not safely utilize the ArchWizards magics until a new Archwizard was born.
(Just to make sure, they called back the spirit of the ArchWizard just to confer with him. They await his next incarnation when he will retake the ArchWizard mantle.)
So they Stayers found the old notes and made more of themselves. The hardest part of the process was carving new models. Many stayed to protect the Great Library. A few started to make a new archive, as the library was not very defensible. Others went out into the world, searching for dangerous Wizardry to neutralize (or contain until the coming of the next ArchWizard) , wizardly tomes to keep from people who might misuse them, and other odds and ends.
A number of Stayers search for new wizards, to train them in the basics, just in case they might be the next ArchWizard. After a few centuries of this, a few have started a school for wizardry. They even teach a few common mages as well, as even they need a good education.
Stayers are classic stone gargoyles, big gothic, bat wings, claws, fang, and so on. They are quite variable in their appearance, but they tend to keep this in common. They have good speed and the strength of stone. With their magic, they can fly, repair themselves, and cast other spells. They have mage sight, so they can see in low light by seeing the spirits of things.
Go-ers, those that left. They are not Gargoyles per sey, but they have come to be known by the name Midarans.