Things You'll Need
Instructions
Craft a gold block by combining nine gold ingots on a crafting table. Create three more gold blocks.
Combine six iron ingots and three diamonds to create a Nether Reactor Core.
Place one gold block at each corner of a three-by-three space. Fill the empty spaces with cobblestone.
Place one cobblestone block on top of each gold block corner.
Drop the Nether Reactor Core into the center of the structure.
Place one cobblestone block on top of the Nether Reactor Core.
Attach a block of cobblestone to each of the four horizontal sides of the block you just placed. It should look like a ̶0;+̶1; sign from above.
Click the reactor to activate it.