Can mercury and the infinite Forrest simulate what is happening on other planets? Don't know if the story has answered that or if lore has either...oh and again, like mercury does it simulate with no divergence.
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Yes it can. The only thing they couldn’t simulate before was paracausal entities, or those empowered by paracausal power. They have overcome that shortcoming, somewhat. That is why we see them simulate Guardians and the Hive in the Forest.