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The blade fragments of Subdue Evil had decayed, leaving only the most core element, the "Dao Charm Spirit Core".
This wasn't actually a very significant matter because the spirit core is the essence of the Dao Charm Spiritual Treasure. With the spirit core, suitable materials could easily be found in the future to recreate the Spiritual Treasure.
The reason why the Subdue Evil Sword Spirit was astonished was that Its original body had long reached the realm of "Immortal and Indestructible, Eternally Unabraded", and although It had not yet achieved "Indestructibility", which meant It could still shatter, once at this step, even if the spirit core were to perish or slumber, the Spiritual Treasure itself would not be destroyed.
Yet everything had turned on its head, as the spirit core of Subdue Evil Sword Spirit remained intact, while only the blade had decayed.
And what was even more unbelievable was that there were no memories within this spirit core.