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The whole reason a Gyldhunter walks into the mist in Mistfall Hunter is Gyldenblood. It is the substance you are sent to harvest, and pulling it out of the world is the point of the extraction loop described on Extraction and Gameplay Loop.
What Gyldenblood is

In the story, the player character is revived specifically to harvest Gyldenblood and use it to mend the shattered Web of Fate. Beyond its place in the lore, Gyldenblood also works as an in-game resource tied to systems like forging. The spelling varies between official materials: the store and lore text use Gyldenblood, while some patch and interface text uses the form Gyldenblod. They refer to the same thing.
Why extraction frames each run
Because Gyldenblood and your other spoils only count once you leave, extraction is what gives each trip its shape. You go in, you gather, and then you have to get out by way of a Returner Woodling, a rare creature you must put down to open the path home. Clearing that final hurdle is what converts a risky outing into a banked reward.
The flip side is loss. If you die in the mist, you forfeit what you were carrying that run, which can include the Gyldenblood and gear you spent the whole session collecting. That risk is sharpened by the PvPvE design, since rival hunters can cut you down and take your haul before you ever reach an exit. The decision to push for one more pickup or to leave while you are ahead is the gamble at the center of the game.
Securing your haul
Once you extract, what you brought out is yours to keep and use. The game provides persistent, account-shared storage, including the premium secure stash Pip's Pocket, so resources carry over between sessions. From there, materials feed into the crafting, forging, and economy systems detailed on Progression, Skills, and Talents.