All Key Of The Diadem Locations — Fire Emblem: Fortune's Weave

Published Sep 23, 2026, 6:30 PM EDT Ryan Thompson-Bamsey has been an Editor at TheGamer since 2021. He has specialized in RPGs, grand strategy games, and visual novels, reviewing major releases in franchises from Square Enix, Larian Studios, and Paradox Interactive. Ryan has served multiple times on the jury for the Indie Cup awards, and has mentored many emerging writers in the games industry. He has covered some of the biggest releases of recent years, including leading the site's coverage of Baldur's Gate 3, Dragon's Dogma 2, and plenty of other massive RPGs. Divine Classes are the strongest certifications in Fire Emblem: Fortune's Weave, but reaching them first requires five Keys of the Diadem hidden across Part 3's refreshed dungeons. The keys can be collected as soon as Part 3's Second Section begins, although their destination does not open until later. Once the Temple of the Diadem becomes available, each key opens one sealed chamber containing the unique items needed for Divine Class exams. This guide explains exactly when the temple appears and lists every dungeon holding a key, allowing you to collect all five before the relevant story event and claim every Divine certification item immediately. This guide contains spoilers for Part 3. When Does The Temple Of The Diadem Unlock? The Temple of the Diadem opens automatically at the beginning of Free Time immediately after the battle against Shenlo. This is part of Part 3: Salvation's Fourth Section, The Hopes of Monarchs and of People. There is no separately named side quest to accept. The Temple simply becomes available on the World Map once the Fourth Section begins. However, you can start collecting its keys earlier: Part 3 dungeons receive new enemies and treasure chests at the beginning of the Second Section, and all five Keys of the Diadem are found inside these new fixed chests. There are five Keys to find: Heretics' Cave in Thaleia Cougar Woodlands in Braxithea Sand-Shadow Fort in Nysiades Enno Isle in the Danann Sea Giant's-Print Fort in Ogmios These keys each unlock a door in the Temple of the Diadem, with each door concealing one or two chests that allow you to access a single class: The Chamber of Sirius has The Cavalier. The Chamber of Distortion has The Calamity and The Blade. The Disciple's Chamber has The Trident and The Godhand. The Prophet's Chamber has The Avatar and The Eternal. The Maiden's Chamber has The Apsara. Collecting an item does not immediately change a unit's class. It allows a compatible unit to take that Divine Class's certification exam, so you will still need to meet its weapon-proficiency requirements and achieve a 100-percent pass rate. Triple-A Games Fire Emblem: Fortune's Weave