The Altar of Light is a block from Xeno's Reliquary that can turn 3 redstone dust into 1 block of glowstone over a few Minecraft days.
After crafting the Altar, place it so that there are no blocks above it, giving it access to the sun. To use the Altar, feed it 3 redstone dust by right-clicking while holding the dust. It will light up when functioning, and eventually create a glowstone block on top of itself, ready for your harvesting.
The Altar of Light can be used an infinite number of times without breaking.
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