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
I was getting meant in the grid trench and then out of know where I see a rock elemental. Luckly I was on a giga and ate it. They give obsidian, sulfur,metal, crystal,and lots and f stone. But it scared the heck out of me😂😂