Fiero is an average pegasus pony living in Canterlot, and rather bored with her uneventful life, until one day while working at the Canterlot Archives she finds an odd grimoire that captures her attention. Upon reading it she makes an unbelievable discovery, Celestia and Luna are not the only divinities in Equestria. There are others, running about unseen to ensure that the world as they know it runs like clockwork. But there are darker things at play, and some have plans that could radically change the workings of Equestria.
Chapters (2)
(Chapter 1)
Not much to correct, aside from minor grammar errors.
Unicorns can't go in, huh?
What about... Alicorns?
Because Pegasi never cause problems...
Does this take place in a different era from MLP's setting?
I can't wait to read more!
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Thank you, I hope you enjoy what I have in store.
Anyway, for your questions, Unicorns could not go in because most of those items were made with a unicorn user in mind (if I forgot to mention that) a grimoire of forbidden spells is of little use to a pegasus or earth pony in the here and now (this is also why you can't know anypony in the schools, for fear you may try and give a forbidden object to them). There are objects that were made for earth ponies and pegasi, and they are not allowed in said vaults.
As for alicorns, that should come up shortly, I believe I had something on them for Chapter 3. But if you refer to, say, Celestia then yes, she is allowed in all of them.
As for the era...I can't reveal that yet.