Minecraft wiki entry for Creating_a_data_pack, associated text: To add loot tables, first create a folder named loot_tables inside the namespace folder. Then, create a file named (loot_table_name).json in this folder or in any of its subfolders. This will be your loot table file. Your loot table will be named in the game as (namespace):(name) or (namespace):(subfolder1)/(subfolder2)/.../(name) if the file is located in a subfolder. All the vanilla loot tables are in the minecraft namespace.