Speculah:Human Soul and Magic

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An anonymous user posted the following theory in thread #27:

Here's what I think:

1. A human soul is actually capable of doing abnormal stuff like shitting rifles. at all times. You can't do it because it has a limiter, just like your body has a limiter that prevents you from using it's full strength in order to avoid harming youself.
2. Once a girl makes a contract with kyubey or whatever (do we even know for sure there are more contractor animals around?), her soul is like on steroids and the limiter disappears.
3. However, using magic would damage the soul (for example, it produces some dark energy, I mean come on it's basically witchcraft no matter how you look at it). This is why soul gems are needed - the damage is redirected onto the soul gem and it slowly dims, corrupts instead of the girl's soul.
4. Once a soul gem is completely black it no longer can absorb corruption and using magic begins to hurt the soul, turning her into a witch.
5. However, it will still absorb corruption if you "force" it to, and that's what they do to transfer it off their own gems onto the "grief seeds", which are actually completely corrupt soul gems.

There. the only inconsistency is the "grief seed cannot absorb corruption from your soul, but you can still transfer it from another soul gem"...

This could be because at this point, a witch perhaps can absorb corruption to become even stronger