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A rancher needs to learn to detect when quantum slimes are primed to take over the reality of a ghost, and act quickly, such as feeding them or splashing them with fresh water as a temporary measure. Quantum Slimes can be one of the most difficult slimes to manage, given their unique abilities.
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Called 'ghosts', these other realities can come true, with the quantum slime aligning with the reality of the ghost, effectively teleporting. At all times, the quantum slime is capable of emitting other possible realities of their being.
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Quantum Slimes appear to have resulted from some sort of event that took place in the Ancient Ruins long ago.