i dont have an image but i used to always have a trap like this
numbers are how deep it is
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0 |
2 |
2 |
2 |
0 |
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2 |
3 |
3 |
3 |
2 |
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2 |
3 |
4 |
3 |
2 |
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2 |
3 |
3 |
3 |
2 |
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0 |
2 |
2 |
2 |
0 |
on the 2s at the edge you place water source blocks, and on the very middle 4 is a sand block with a cactus growing off it
you can run any mob into it but cant get the drops, its handy to have nearby if you get jumped leaving your house, just run round it :)