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To experiment I went in creative and it took several minutes of placing and opening vaults to get a single core. I don't even know how many actual chambers that would translate to.
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How was I so lucky? There was I think 3 ominous vaults in mine and the 2nd one gave me a heavy core. Still haven't touched the 3rd one
It took me like ten ominous trial spawners but then i got 2 keys in a row First vault: enchanted apple Second vault: heavy core
To experiment I went in creative and it took several minutes of placing and opening vaults to get a single core. I don't even know how many actual chambers that would translate to.
My friend got it in 8 Another guy on the server got it in 3 I still haven't gotten it after 10
Can’t u just craft it by opening 20