I assume there's another Emblem from the Hard or Prestige Raid which tracks this stat. Similar to how you get the Nightfall Emblem only from the Prestige Nightfall.
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Yea, but even the prestige emblem is a letdown to me, it says in the description "tracks the number of nightfalls you've completed" but it only tracks prestige nightfalls. If there's an emblem that tracks wins in trials, wins in competitive and wins in quick play, there should be emblems for regular nightfall and regular raid completions. Just my opinion