Going off your video indicates that you're looking in the wrong area in the Spine.
For this week (Strongest Curse | War Chests triumph), the chest is found near the central Tower in the Spine.
[url]https://youtu.be/iHovCq_kVfA?feature=shared[/url]
Time stamp starting at 2:55 will show you the route that you need to follow to find that chest.
English
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Wait a minute there’s different routes depending on the curse???
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Yes. There are three sets of 10 chests for each week of the curse that are associated with one of the following Dreaming City triumphs Curse at its weakest: Hidden Riches Curse is growing stronger: Bolder Fortunes Curse at its strongest: War Chests