Beam of Power (r) is the strongest support beam in Minecraft. It can be found inside Volcano Islands. Its durability is equal to that of a block of Stone. It is required for activating the Redstone Signal Beam in order to open the entrance to the Volcano Island. You need to destroy at least one other structure before you can build on a Volcano Island, because otherwise it won't appear on the world map. You can only have 8 active Volcanoes at a time. Volcano Islands cannot be built on water or lava. However, if they are built on land then they can be destroyed like any other structure. The durability of a Beam of Power is extremely high, so it shouldn't be destroyed too often. Otherwise, you will need to find another way to activate the Redstone Signal Beam.