Hello, Sparta. ^^ Do you mean the big rock that was in Streamclan? You may want to ask the map creator. If she's online, I can ask her how/where she got it.
Oh. Have you asked her to check her files, and see if it came with a readme? ususally, mesh-makers credit themselves in them. I still have the map, and if you want, I can check in it's file, and try to find it. c: