Upon reaching Renown 5 with the Keg Leg's Crew in Plunderstorm, Dragonflight players also unlock a new vendor in Valdrakken offering a limited amount of mid-level crests and a single Bind-on-Account cache containing normal Amirdrassil loot!
To unlock, simply play Plunderstorm until you reach Renown 5, and the next time you log into Dragonflight, you should automatically be prompted with the quest, A Keg-Stamped Package. Heading to the Valdrakken inn, you'll see a few new NPCs in the corner, where Da'kash Grimledger, Plix Sputtermouth, and Polly Roger have taken up residence. Turning in the quest will grant you 15 bind-on-account Keg-Stamped Coin, which can be mailed to any character on your Battle.net account.
Da'kash Grimledger will then have a new vendor option, selling:
The Pirate's Booty contains a single piece of normal mode Amidrassil gear and can only be purchased once, but is also bind-on-account, so send it to the character that needs it most! The crests can be used for mid-level upgrades, though it's currently unclear if players will have any way of obtaining more Keg-Stamped Coin; as of right now it appears 15 is all you get!