Nether

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Place five cobblestone blocks in a cross like this.

Place four gold blocks in the. Corners of the cobblestone cross.

Place a nether reactor core on top of the cobblestone block in the middle of the cross.

Put five more cobblestone blocks in the shape of a cross on top of the nether reactor core.

Put one cobblestone block on top of each gold blocks. So you need four cobblestone blocks because there are four gold blocks.