What is the true teaching of Brundecal?

There is no known teaching or concept associated with "Brundecal." It's possible that this is a misspelling or a fictional term.

Could you please clarify:

* Is this a real term? If so, can you provide more context or information about its origin?

* Is this a fictional term? If so, what fictional universe or work does it come from?

Once you provide more information, I can help you understand what "Brundecal" refers to.