Very Sad Story. =*[ [Minecraft]

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I had everything, diamond pickaxe, diamond everything, and I just spent hours trying to find my way out of my cave. I got obsidian during this, and made a portal outside. I went to nethers and collected all sorts of stuff. Then, there was this lava from the sky falling, so I jumped down to check it out, and it took me AGES to finally get down to the bottom (jump was HUGE) and to find the bottom pit was nothing but lava. Fall would've killed me either way. I didn't know it was that deep, and here's the sad part: I made a bed. When I died, it said "House bed destroyed or missing" and then I was like "maybe something messed up" when I went to the location I made it (I think, because I made it FAR away from the spawn) was the same structure that was set up in the same spot the first time I entered the seed. So the whole server reset on me. I had caves....everything...Q_Q