Talk:Prisma Causeway Event/@comment-4802891-20160906112538/@comment-29830134-20160906121901

If it is like the others, you will have a few classical quest and once done you would unlock the raid level, where you will have to choose a difficulty level which would determine the boss's HP.

The Boss will have two HP bar, one determined by your difficulty level and a general one which shows the overall damage done by everyone. Every damage that you do at the boss will be reported at the general bar (even if you end up losing the fight, it will only count as fleeing so you will not loose anything).

Once the general has been emptied by everyone the milestone is done, and you may have to wait for the next one to unlock, it will depend on the speed at which everyone will pound on the boss (generally it goes quickly which should give you time to farm event's items).

From there it's rince and repeat.

But like I said it is IF it's like the last ones. Still I hope that it helps you ^^ (Got to level up my medea lily, I focused on preparing the wrong servants for this event :/)