The mark can be redeemed from Ab'xal or Ip'xal in Azj-Kahet's City of Threads.
Following the trend set in Patch 10.1 to help players acquire tier set bonuses more quickly, The War Within Season 1:
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Mark of the Spelunker Supreme – Free Tier Piece from Heroic Nerub-ar Palace
Returning from Dragonflight, the Mark of the Spelunker Supreme is awarded for defeating Queen Ansurek on Heroic difficulty, reaching 1600 Rated PvP ranking, or 2000 Mythic+ rating, and can be turned in for a single free piece of Heroic-level tier gear!
