Eternal Pose Permanent Magnetic Recorder

Why this matters

The Eternal Pose is the first on-page extension of the Log-Pose mechanism beyond the basic island-to-island recorder canonized in Ch. 0105. The world-building extends the navigation-grammar of the Grand Line in three ways:

1. Permanent vs. dynamic — Log Pose re-records at each island; Eternal Pose is locked to one island forever.
2. Skip-the-route — Eternal Pose lets a navigator go directly to a specific island without traversing the intermediate Log-Pose-route islands.
3. Multiple-pose stacking — implied (a navigator can carry multiple Eternal Poses for multiple key islands).

Forward-pattern: every later Eternal Pose installation re-keys to this chapter’s mechanism-canonization:

• Skypiea — the Skypiea-arc opens with a Log-Pose-pointing-up beat (sister-mechanism to the Eternal Pose: a Log Pose can record a sky-island).
• Zou — the Sanji-Reverie / Whole-Cake-Island arc uses a Zou-Eternal-Pose as a key navigation-prop.
• Whole Cake Island — the WCI arc uses a Big-Mom-fleet Eternal-Pose to set the destination.
• Sphinx / Wano / Egghead — every later destination-locked island uses an Eternal-Pose-prop.