What are Chests of Rage? Rare describes it thusly,
“These chests are bursting with fiery fury which will be vented sooner or later! Perhaps there’s a way to cool down a Chest of Rage, or alternatively make it blow its lid. Remember, when you’re a pirate, every trap is also a weapon…”
You’ll be able to claim the Chest of Rage bounty voyages by talking to Duke in any tavern. You’ll be tasked with bringing back a Chest of Rage from The Devil’s Roar. Additionally the Molten Sands Fortress also offer Chests of Rage inside its vault. Just, you know, be careful.
A host of Ashen Rewards and new Emporium items are up for grabs as well in the latest free update.