Once upon a time there was a survivor named Bob who was in the dessert collecting Stone when he went up to a giant rock and hit it, all of a sudden it transformed into a giant hulking beast. He ran as fast as his little legs could take him he got about a while away and thought he was safe but then the rock elemental threw a rock at him and he almost got hit but he jumped out of the way then his tribemate Timmy came and picked him up on a snow owl and they escaped.
Wiki says: To tame it, you need brute force like a rock straight into its head.
Billy (tribe of billy) - lvl 2: Will my Journeyman slingshot work? I just spawned here and i was told it eats rocks! I have some in my pocket! I WILL TAME IT