Description of the ship says:
[quote]Acquired from completing a Season of Opulence Triumph.[/quote]
I completed all triumphs in the season of Opulence except for Crown of Sorrow dayone.
https://i.imgur.com/0upUkXy.png
Although I think the description is wrong, because [url=https://www.reddit.com/r/DestinyTheGame/comments/c5cd3d/the_emperors_chosen_ship_drops_from_the_heroic/]it was dropping from Menagerie on Heroic difficulty[/url]. I remember that it was dropped to me and I dismantled it.
Now I cannot re-acquire from collection.
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Allo there, Unfortunately if it's not in your collection then you'll need to wait for it to be readded into the game tombe earned again.