An elaborate network of traps Justice Light built across the ninth floor and never once needed.
Before triggering the one trap that mattered, Justice Light took a last look around the elaborate system of traps he had built and never needed. All of that preparation — the whole architecture of his craft — went unused, and burned with the rest of The Ninth Floor when Emberus filled the world with fire.
What he did use was a single simple, tiny trap held by a piece of twine, positioned over a permanent portal into The Nothing.
An elaborate, layered network of traps covering the ninth floor, all of it untriggered.
The unused masterwork that frames the one small trap that actually mattered.