To make a mob farm in Minecraft that automatically spawns and kills enemies, you'll need stone, trapdoors, chests, hoppers, ...
You are going to need a lot of blocks for this build so you should better get to farming. As for the blocks themselves, you can pretty much use anything. Cobblestone and Wood are the most common ...
Minecraft has many amazing features, but its mobs, especially, are one of a kind. The game has several different types of them. Some are passive and do not attack players, while others are hostile and ...
You can make an Iron Golem in Minecraft using four iron blocks and a carved pumpkin, or find them naturally in the world.