History of 13. THE MISTAKE

Overview

This is chapter 13 of 13 in The Liar, a lore book added in Season of the Worthy that tells the story of Felwinter as a wanderer, Warlord and Iron Lord. The triumph has no in-game description; it is a lore record.

How to unlock

1. Obtain the Exotic shotgun Felwinter's Lie (the Season of the Worthy quest "The Lie": complete Seraph Tower public events, scan scrap piles in "A Warmind's Secrets", earn shotgun kills, then visit the Lunar Seraph Bunker).
2. Get kills with Felwinter's Lie. Lore entries unlock as you accumulate kills, in chapter order; the sources I could open do not give exact per-chapter kill counts.
3. Open the book from the Triumphs/Lore tab to read this entry.

Chapter summary

The Iron Lords debate the risk of infiltrating Site 6 and agree the potential of SIVA justifies the danger. Felwinter argues passionately that it could bring a new Golden Age, securing their consensus. The title points to the tragic outcome of that decision.

Notes

Sources agree the book is tied to Felwinter's Lie and Season of the Worthy; the Shacknews guide predates later changes, so unlock details may have been adjusted since.