Fire Emblem Warriors: Three Hopes - The Loop
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Far beneath the castle, down a long shaft accessed via a platform elevator, is where Testa-Rossa was kept before the Infernal Rite was performed.
It returned back to normal shortly after the destruction of the Vermillion Apocalypse.
- Trails of Cold Steel III, Chapter 4: "Radiant Heimdallr", 07/15.