Lava buckets are a great source of fuel for the furnace. It will last for a long time, which is really useful for smelting. Lava is also a key ingredient in crafting obsidian, which is one of the rarest blocks in Minecraft. You will generally find lava when you go mining underground. Make sure you always carry some empty buckets to collect lava and bring it back to your base. In case you don’t have any buckets, you can always come back to the same spot to collect lava.
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