they were the keeper of the wards, guardians of the seals that keep the evils away or lock up.
when at nights, they hunt the evils that are loose or freed from prison or sealed vault of catacombs or crypts.
they are akin to dragons, stoneskins get upgrade from sandstone, slate, granite, marble, etc.
they cant fly until wing quest upgrades.
wingless are Warders of the Seals, once they get wings, they become "Guardians", ocassionly, few had gone rouge and corrupted by the blights that tainted them.
they are normally found among the ruins, ancient temples, catherials
it would need few new structure design for them to live that look like ruins (small lot), old churches (meduim lot), castle (large lot), ancient tower (mega lot) when dragons built lairs going down, and gargoyles builting is going upward among the sky.
wingless bi-ped would have to use stairs to reach to top side to view the homes of gargoyles.
these are only ideas of what could be happen, nothing more than just suggestion, but sound cool on paper, but i am aware of dev team's limited time.
i am surprised why Dryads still dont have thier natural home structures, they live in hallowed trees or under the roots, all they need to click on "acorns or pinecones" as portal like device into the home environment.
living in human-like homes is like poison or feeling of death because the wood were "cut" from "life source".