Crucible Marks is a Grimoire card from the original Destiny (Destiny 1), found under Inventory → Economy. Grimoire cards held most of the game's lore and were read on Bungie.net and in the companion app, not in the game itself.
Card text
The Crucible is a program of relentless live-fire training, hardening Guardians for battles to come. Competition thrives on risk and reward, so Lord Shaxx has seen fit to dispense Crucible Marks to those who excel.
Guardians with a name in the Crucible can spend these Marks on elite gear. Shaxx considers it fitting that the best should earn the best. The City's factions, fond of using the Crucible as an arena to advance their own interests, will also accept Crucible marks in exchange for their equipment.
Guardians eager to win Crucible Marks should fight in the Crucible, with particular attention to those challenges Lord Shaxx deems important.
Guardians with a name in the Crucible can spend these Marks on elite gear. Shaxx considers it fitting that the best should earn the best. The City's factions, fond of using the Crucible as an arena to advance their own interests, will also accept Crucible marks in exchange for their equipment.
Guardians eager to win Crucible Marks should fight in the Crucible, with particular attention to those challenges Lord Shaxx deems important.
Grimoire text written by Bungie, shown as it appears in the Destiny 1 game files.