"Cursed Treasures" is my idea for a SoT season. As the name suggests, it would add more cursed loot like the Chest of Sorrow, Rage, etc...
Our first treasure is the Chest of Betrayal. The gold and commendations would only be given to the person who sold it, not the whole crew. It would create a roughly galleon-sized area where friendly fire is enabled. Not only would this be a fun mechanic, but it would also allow crews to practise their combat skill on eachother.
Next up would be the Chest of Misfortune and Chest of Shipwrecked Misfortune. These could periodically give off random cursed cannonball effects. The Chest of Misfortune would be more dangerous towards players, giving off multiple harmful or obstructive effects. Meanwhile the Chest of Shipwrecked Misfortune would be much more harmful towards ships, possibly even sealing the vessels fate if it gives off an ill-timed Ballastball effect.
The Chalice of Furious Phantoms would spawn Phantoms around it, causing a nuisance for players. However, it could be used as a weapon if you were to hide it onboard and enemy ship.
Finally, the Skull of Disappearing Davy would periodically teleport away from the player, hiding itself in nearby locations.
