You will spawn at a swamp that has four witch huts. One of them will surely spawn a witch for you to fight and from which to collect rewards. The coordinates to all of the huts are as follows:
A bit to the south, you will also find a woodland mansion at coordinates -875 545. And, of course, you will be able to locate a secret room at coordinates -800 78 502 with a chest full of redstone.
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