Assertion: dagger's place | /r/HasProperty | unexpected
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Source sentences:
text: The dagger first popped up in an unexpected place: as an illustration in an old book in the Season 7 premiere, "Dragonstone," when Samwell Tarly is reading a book about the Long Night (i.e. the last time the White Walkers came), discovering that there is a mountain of obsidian under Dragonstone.