Sacred Sword Theory - Full of Spoilers

Please point me in the direction of another thread if this has been considered before, or if it’s been explained because god knows I can’t remember everything from these books, but…

!Wandering War gets consumed into Heartlance in unclear circumstances. Akari’s magical theory knowledge and use of her brand new body don’t make sense. Heroes can choose to help the ruin crystal’s simulation of the fall of Rendalir. Gods can force other gods into artifacts to power them. Papa Muramasa is remaking the swords. Vendria is a god split into different crystal pieces for her different aspects.!<

At first I thought the swords would be some piece of the heroes who failed and agreed to it, but if Vivi is right…maybe they’re made from pieces of the failed crystals?

Bad with people, varying degrees of proficiency with a body (we know crystals can have them), magical knowledge and can have many pieces broken. We also know someone is scavenging them.

Anyways, please correct me, tell me your thoughts or point me to where smarter people have already discussed this.