So, later on in the series, during the fight against Zeref, we see Mirajane use Satan-Soul but she also used souls that she had collected during the Tartaros arc. My question is: why can't she fight for long and how did she collect so many souls if she can't fight?

  • she stated "the stronger demon from she uses, the more energy it costs"
    – xmastertje
    Jul 24 '19 at 13:27

because you see multiple people run out of magic power throughout the show and she won't want to overdo it and be so exhausted not to move like Erza in the edolas arc and she might have finished the tartaros people off fast or with help

  • Please include relevant sources/references to support your answer.
    – W. Are
    Apr 30 '20 at 11:26

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