While playing path of exile, on the 3 month server, i thought to myself, what about doing the same for haven?
For haven, there would essentially be 2 worlds. One permanent world that lasts forever, and a 5 month world. Haven is the type of game that is more fun when starting over in a new world, so I think this is for the best.
-worlds are separate, you can't bring your awesome 99999 strength character to a new world.
-when a world ends, your character, inventory and equipment gets transferred to the permanent world.
-new worlds could have some sort of dangerous or interesting element, or something you can only get in the new world.