From Software’s Bloodborne has a game breaking glitch which emerges part way through the game.
The glitch in question involves a mandatory item called the Lunarium Key not appearing after completing a boss fight when one player enters another player’s game in the Forbidden Woods. The glitch doesn’t always appear so you can get lucky and it’ll work just fine, however if you want to be certain you don’t see this problem pre-update is to play solo in the Forbidden Woods up to the point you obtain the Lunarium Key.
Bloodborne’s update 1.02 will be available next week according to Sony, it isn’t the same update that is in development to reduce load times, that update is still in development and will be available at a later date.
From Software and Sony are both aware of the issue and are developing a fix to prevent it happening.