已对照游戏内数据、官方开发直播与补丁说明核验，
已针对 Preludes 15 人工核实。
工具 · Common
高级 Sinecure 专用钥匙，开启 Fort Mirifuir 的上锁门。Mirifuir 围攻获取。
Fort Mirifuir siege event · Participate in Mirifuir Siege; defeat high-ranking Sinecure officers
Fort Mirifuir — ~3h cycle · Wait for siege cooldown reset if missed on first run
以下路线来自社区整理与攻略汇总，掉落率请在游戏内核对。
高级 Sinecure 专用钥匙，开启 Fort Mirifuir 的上锁门。Mirifuir 围攻获取。
Mirifuir Key is a siege-progression tool item obtained exclusively from the Mirifuir Siege event. To farm it, participate in the siege and engage the high-ranking Sinecure officers that spawn during the event chain — these elites are the listed drop source in community catalogs. The key grants access to locked doors inside Fort Mirifuir, so it is a one-time progression item rather than a repeatable farm. If you did not get the drop on your first siege completion, re-run the Mirifuir Siege when it cycles back (approximately 3-hour cooldown) and defeat the Sinecure officers again. There is no merchant source for this key.
Siege: Mirifuir Siege — high-ranking Sinecure
同类别材料横向对比，便于判断稀有度与主要掉落来源。
| 物品 | 稀有度 | 主要来源 | 刷取路线 |
|---|---|---|---|
| 米里弗钥匙（Mirifuir Key）当前 | Common | Siege: Mirifuir Siege | 有 |
| 地窟钥匙 | Rare | Quest: Pay Respects Sparrow's Tale —… | 有 |
| 乔塔炮塔钥匙 | Rare | Foe: Sinecure Knight | 有 |
| 箭矢 | Common | Vendor: Avakot merchant | 有 |
| 笼钥匙（Cage Key） | Common | Quest: Orengall pups rescue | 有 |
| 凯恩霍德钥匙 | Common | Foe: Banneret Anara | 有 |
| 沉思者羽笔 | Common | Quest: College of Pensives | 有 |
| 树液龙头（Sap Tap） | Common | Quest: Wevetwood / Poppet storyline | 有 |
| 辛丝克抓钩（Synsylk Grappler） | Common | Foe: Sinecure soldiers | 有 |
| 雷石 | Common | Enclave Votive — A Worthy Tribute… | 有 |