* You will get 15 attempts to defeat the final boss of each wing (Putricide / Lana'thel). So far we assume that the amount of attempts is shared between bosses. (And I'm sure blue posters will clarify that a hundred of times)
http://www.mmo-champion.com/index.php?page=891 The Blood Princes
http://www.mmo-champion.com/index.php?page=895 Blood Queen Lana
If you still have trouble understanding how the raid unlocks work, here is a nice flowchart!
source mmo champion
