Obsidian is the strongest breakable block in Minecraft. The only block that is currently stronger is bedrock, which is indestructible. While Obsidian may rarely occur naturally, it is generally created from the collision of water and spring lava. The main use for Obsidian is the creation of portals which can take players to The Nether, as well as creating explosion-proof bases and walls. The only thing capable of destroying obsidian is the Wither. However, Creepers are unable to blow obsidian up.
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