Xenoverses are usually used for checking up on all of the verses, see how they are doing; so that one of the verses doesn't malfunction and blow up.

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Xenoverses are also used for anti-reality-bending chambers for alters who misbehaved.

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xenoverses are somewhat connected with the strings attached to them. you can travel through them to other Xenoverses for conveniences, but at the risk that you will be contorted beyond recognition, unless you are an alter

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they can hold up to 75 metaverses

they are 20x bigger than metaverses