Iron Islands

5 Dimensions full of blocks. Each dimension is made entirely out of a block that is used to make tools. When you craft the blocks together, you get a bonus dimension with every block from the other dimensions. If you place a Magic Throne, crafted by 4 magic blocks and a carved pumpkin, the "Magic King" will appear!                                        

When a block that is used to make tools is crated with a lava bucket and a raw version of that block, you get a portal igniter. If you use a portal igniter with a nether-shaped portal that corresponds with the igniter, you will create a portal to that block's dimention.