Mining obsidian is not only time consuming, but dangerous. Looking for caves with obsidian and risking death by creeper, zombie, or lava just isn't worth it sometimes. Luckily, obsidian can be farmed, just like cobblestone! You'll no longer need to put your life on the line for this most-indestructible of building materials.
Step 1 Create a Controlled Water Flow
Step 2 Place Pistons to Control Lava Flow
Step 3 Place Lava
Step 4 Generate Obsidian
You'll be doing no more spelunking with spiders and undead monsters now that your automatic obsidian generator is complete.
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