Since noone replied to this post i choose to not open another thread because it is a similar idea.
So my idea was to start with 8 Keys but only one chest.
Every Nation starts with one key which sails in their territory via marked AI ship. this AI ship cant get attacked just like this. for this you can use the "Pull flag, sail to destination" systhem. When a flag is pulled the defending (D) nation gets a notification and a location on the map where the ship is. The (A) attacker only gets an area in which the ship is in. When A found the ship and is sailing with their fleets toward the Trade Ship, D got a few possibilitys: either they stand close to the Tradeship and risk it being pulled into battle or they sail towards the enemy and keep the Tradeship out of battle but risk it being attacked by a 2nd Fleet that sneaked another route.
More information:
-A flag can only be pulled when over 500 people are online
-When a flag being pulled. the Ai ship will try to get to a Port to save itself. when the ship reaches the port the event is over for now and it will have some cooldown to sail again.
-Only one KeyBattle at a time
-The Key will sail for A if they successfully capped it and sunk any other ship in battle (if the Keyship sinks it respawn after some time for D Nation
What happens when one Nation or one Alliance (yes allies should count together in this matter) got all 8 Keys ?
When this occurs there will spawn an AI Tradeship in the Countrys Capitol or the Allied Capitol(s). This fleet will sail towards The Chestisland (probably around 64/26). All other Nations getting Notified. when the fleet reaches this destination there will be a battle. But the battle is a very special battle because:
-it is inside a Cave, the Treasure Cave. ( i dont know how difficult that would be but it would be a very cool atmosphere when you only have ligth of some lanterns on deck or fire from a ship and you can see stalagmites and such)
-only 7th Rate are allowed (or maybe only gunboats?)
Problems this idea have:
-Slots for 8 Nation would be difficult yes you could go for 7x3 + 1x4 (the nation with the keys) but that would left out alot of players that participated in getting the Key.
-Obviously the cave but that could also be a small harbour or something like that.
The Loot
After this battle everyone of the winning nation or alliance around that Island will get Loot. (Their should be a little freeport in which the people in the 7th rate (gunboats) spawn to buy a trader lynx and put your other ship in fleet and carry your Loot back home. you dont need an outpost in this freetown but you cant tp there)