Would you think it would be cool if Sea of Thieves added a cave or a huge cavern with all sorts of mysteries and surprising treasures?
You guys would think it's cool?
This isnt really detailed enough to give much input on. Hoarder vaults, the shores of gold, and the heart of fire could all be described as caves or huge caverns with mysteries, and only heart of fire lacks surprising treasures.
As well many riddles can bring you into caves to find your treasure, so even some of those could be counted imo. This really needs a little more detail to explain what you are imagining in particular to give input on.
I'd personally love for this to happen all over the game instead of isolated for one huge cave. Sadly, I don't think they'll ever do this. The last mystery we had, only took place on social media instead of being in-game (how does the Pirate Lord know about Twitter?), where I wished they kept 100% of the clues, keeping people IN the game itself.
