The "Haunted Triumph" which is a Secret Triumph requires, "View the "Haunted" Cinematic".
I have purchased and completed The Chosen season Questline on two different characters and never saw any such cinematic. Considering that according to tracking sites the Triumph has a high rate of completion (comparatively), it seems bugged or am I missing something?
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There was an issue with Challe-blam!-'s Proving V starting, which was to start after the cutscene. In fixing this quest so that people can continue it and complete the quest the cutscene no lo-blam!- plays. They have not said what will happen with regards to the triumph.