This would be a meg that is classed as a world event and would continue to move around the server until some one kills it. Each time it sinks a ship it consumes its loot/supplies/flags etc and carries this until defeat at which point it would release the loot for collection by victorious ship. The idea would be that this could go on for days and have mega stacked loot.
To make it more difficult and make it mega!! I would suggest different versions that are vulnerable to different combat depending on where they are on the map, how much loot, what type of loot etc. so for example if the Meg had defeated 3 reaper ships it would protect Athena ships before attacking them. If it had lots of ashen loot it would set fire to the ship on charging to attack the ship. Also depending on last combat it would be more immune to some weapons. Eg cannons deal 50% less damage but sniper does double.
Finally on completion of so many of these mega megs (commendation) could randomly but still rarely still spawn the shrouded ghost as a reward.
