The trap supply store Justice Light asked to run in penance, at the cost of extending his own indentureship.
After leaving the dungeon, Justice Light made a deal: he asked for the right to run the trap store. He knew it was a bit silly, and it added time to his Indentureship, but he wanted to make sure the best supplies were always available to crawlers — a direct answer to the dozens who died on his level after he murdered The Lizard Shopkeeper and left them with nowhere to buy trap gear.
He worked it for several hundred cycles as a merchant. By his own bleak assessment, it did not help; it was already too late. The tenure ended when Damien told him and Dante that merchants they would be no longer, and reassigned them as castle guards — the posting that would cost Dante his life and Justice his wing.
Justice Light's attempted atonement, a trap shop run at personal cost for the benefit of crawlers he would never meet.