What was hidden?
What was so important?
What was so powerful? That's not what you should ask yourself! The question is
why didn't they destroy it.
Well they either couldn't destroy it or didn't wanted to do it, because they thought it will be needed in the future.
Well, then back to the orginal question: What is it/he/she?
What is in the Box of Pandora.
Knowledge?
The Wesen history starts. How Royals-the Königlichen- can learn to woge every generation. How Grimms are 'made'.
Water?
Special liquid, which let's temporarily let the drinker see the woge, short timegrimm. One, which let's Grimms see every Wesen without woge. One, which forces a wesen to woge or doesn't let them woge.
Or perhaps not a liquid but an artefact doing the same.
Mass-control?
Yes, mass-controll. Why didn't the sane one's destroy that? It was the time of the cursade! And some where optimistic.
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Please review
And feel free to add ideas inside the reviews. The ones I find good and solid or humours, you will find in the next chapter.
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Also for the one's under the readers who want ideas, a muse, a challenge or a prompt.
Visit my other Grimm story 'A drug gives ideas'; which gets better in chapter 2,3.