"DM pwease help me!" Because, you can't find a rule that says this happens, and I can find the rule that says the DM determines if an action succeeds automatically, fails automatically, or requires a roll. If it requires a roll, the GM picks the check and sets the DC and determines the outcomes (pass or fail). You have no ability to declare this to be true, at all. This isn't 3.x with diplomancy.
Everything has a Check against a DC or creature's insight. 30 is nearly impossible, as you see in the player's book.