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We've seen these "Anti-Pymary" barriers before, notably back in Ethelmik where the Crescian army was using one to block off their construct storage. Since a wright has to know the name of a Material in order to cast on it, Anti-Pymary barriers work by obfuscating their construction, often being made of a melange of different things and then containing some interior pymaric that alters all its Aspects, so a wright cannot tell what the heck it is. The particularly sophisticated ones are triggered to explode or attack outwards if you attempt to brute force your way in, so they're a pretty serious obstacle even for the best of wrights.

Try explaining this to a trio of impatient adolescent two-toes though and it just sounds like an excuse!