Minecraft wiki entry for Loot_table, associated text: Below is a list of all loot tables that exist by default. More tables can be added in the world save for use with custom maps. Note that some blocks, such as bedrock, end portals and other blocks unbreakable in survival do not have loot tables, some blocks share loot tables (namely wall and floor variants of blocks) and that certain drops, namely head drops from charged creepers and the wither's nether star, are currently not covered by loot tables.[1]