The hero has accomplished their goal; they’ve killed the Big Bad, or defeated them forever, or at least scored a major blow against the antagonist. They’ve done what they set out to do…

…but not so fast! It turns out that by the very act of success, they’ve unwittingly made things worse.

This trope can be annoying (in video games) as often-times Stupidity Is the Only Option, particularly in the case of a MacGuffin Delivery Service… It is not particularly fair to try to make the player feel guilty about a course of action they had no control over, and indeed, might’ve gotten a “Game Over” if they attempted to not fulfill the objectives in question.

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The TV tropes page for this actually has a lengthy RPG subsection, listing different scenario’s in which this trope occurs.