like hyper told above its your realm going away from the overworld
i think the normal ammount of time it decaying is 1 day of not visiting the overworld on 0 blocks build, the more blocks you build in it the longer it stays without needing to visit it
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i think the normal ammount of time it decaying is 1 day of not visiting the overworld on 0 blocks build, the more blocks you build in it the longer it stays without needing to visit it