i found it and you press the obsidian in between the cobble and cobble slab, you'll be tp'd to a room where you can edit it @itsryan212 @LiamPlays

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oh, I didn't see this and I still had some runs go into a cave with diamonds and I was really confused. thanks for this, sorry I didn't see it till now.

thanks :)

I know its 1 block in the nether= 8 blocks in the overworld, so is it some really precise spacing, or is it rng?

thanks, that's actually really helpful:)