If you want to tame a max level with stone on an official server then say goodbye to about 2 weeks of your life you will not get back, it might be worth it.
Be friendly and caring when engaging this peaceful creature. He may disguise himself a rock, as he is very shy. Use stone to passive tame this gentle giant.
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