Talk:Summer 2015 Event/@comment-112.206.201.133-20150811135518/@comment-26315106-20150811141019

The bar is reduced according to the damage you do to the flagship in last node (can't do more than their HP). It carries over and replenishes only if you change difficulty. Once it's low enough (ie empty if you sink it once), the boss takes its "final form" (stronger). To empty the bar you have to sink that final form flagship, only damaging it is not enough. You'll understand better once you see it yourself, it's a bit hard to explain like this.