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At the end of the Bladedance three years prior, Restia, and by extension, Ren Ashdoll, was corrupted by the Otherworldly Darkness. Later, at the Bladedance in the Academy town, Restia gave Claire the Frenzy spirit, which corrupted Scarlet. After Kamito had defeated the Frenzy spirit and saved Scarlet, Restia proceeded to corrupt the militiariezed spirit which the Bladedance had been held to decide who it would be presented to for contracting.

Anyways, the thought that crossed my mind, is what if it was the Otherworldly Darkness that corrupted he Militiarized spirit and drove it mad. It was never stated that it was a Frenzy Spirit that drove the Militiarized spirit mad.

Also, in regards to the Spirit War. Iseria Seaward stated that the Elemental Lords were corrupted by the Otherworldly Darkness centuries prior to the development of the Bladedance system's creation, though she herself knew not when it happened. We know that the Spirit war was Ren Ashdoll rebelling against the other Elemental Lords. I have two theories about this.

One is that the Otherworldy Darkness was something like a grudge left over after Ren Ashdoll's demise. We know she created two systems for her return, one being the Demon King system, and the other being the reincarnation system on Restia, her living will meant to guide the awakening of the Demon King, though we are never told that there wasn't some remmenant left over.

The other, more plausible theory, is that the Elemental Lords were already corrupted at the time of the Spirit War, and that this is the reason Ren Ashdoll rebelled. This falls in line with how Restia knew of their corruption at the time of the Bladedance 3 years prior, and why she asked Kamito to help her liberate them from that darkness, her being Ren Ashdoll's will incarnate.

Then there is Est, both a cursed demon sword and a Spirit weapon that refused to take sides during the Spirit War. What if by chance Est was a spirit weapon designed specifically to combat the Otherworldly Darkness. This would explain why the Elementalist from the Holy Kingdom of Lugia, who we can assume to be the Holy Elemental Lord incarnated, was after her.

Then there is that which Kamito saw in the Otherworldly Darkness within the True Shrine at the end of the Bladedance. Angels. Couple that with the Holy Elemental Lord being missing, how much of a stretch would it be to consider that it was the Holy Elemental Lord was the one that brought in the Otherworldly Darkness. If this were the case, everything would fall into place. Est being a Spirit weapon designed to combat the Otherworldly Darkness, the one Elementalist who we can assume to be the Holy Elemental Lord's drive to destroy Restia, the Darkness Elemental Lord's will incarnate.