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There is the Aether!
(lemmy.ml)
In tradition of myriads of "where is the Aether" posts (not here on Lemmy, but you know where), I present you the Aether in a Don't dig up! secret world seed. The End.
I just started playing (30hrs / no wiki). What is the aether?
A small biome where you can transform certain items. It's not really necessary for progression but a nice to have.