So about vault monsters

So what exactly are they? Are they like ancient powerful beast they sealed up?

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Guardians are protectors of the vaults, the power of the vaults.

A lot more is explained in the Eridium texts

I was wondering that too. The only feasible answer I came up with is The Destroyers offspring or minions. They all seem to have a shapeshifting ability and evolve to match their environment. Power battery theory might work but why would it attack Eridians if it was made by them.