well the cheapest way is this
key: b = beacon
bl = either block of iron, gold, diamond or emerald
b
bl bl bl
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The beacon gives minecraft players powers similer to potion effects for a radius. In order for it to work, you have to place the beacon on a pyramid of mineral blocks, the stronger the mineral, the stronger the effect (diamond blocks give the strongest effect), and the bigger the pyramid, the bigger the radius ( the max height is 5 before placing the beacon). You decide what power the beacon gives by left clicking.
Although the main goal in Minecraft is to go to the End dimension and defeat the Enderdragon, it may be harder to create the Wither and defeat it. Once you defeat it, it will drop a Nether Star, which can be crafted into a beacon. If you make a pyramid of iron, gold, diamond, or emerald (or some of each), the beacon will give you special buffs. This is probably the hardest thing to do in Minecraft.
you need to be in multi-player or a server to make the TNT work.
beacons are used in minecraft for getting some potions on you and knowing where your home is on single player
Lighting a beacon is pretty easy. You may or may not have thought that when you place a Diamond, Iron Ingot, Gold Ingot, or Emerald, it would light a beacon, but in fact you need you make a 3x3 square made out of Diamond, Iron, Gold, or Emerald Blocks, and place the beacon in the middle, wait maybe 1 or 2 seconds, and it will shine a huge line of light about 300 blocks high