A newly-discovered Bloodborne bug makes the bosses much easier to beat.
Reddit user Meatballz has found out that if you leave your game running for 12 hours or more, the bosses' movesets get reduced severely, meaning that most of the hard-to-avoid attacks are now gone.
The user discovered this during a playthrough marathon and suggests that it could be due to a memory leak. Restarting the console restores them to their former glory.
"I just tested this yesterday by turning off the PS4 power saving options and leaving Bloodborne running all night. Sure enough, when I played in the morning Logarius had transformed from an intense spell casting maniac into a senile old man who did nothing but attack with his scythe over and over," he said.
Other users in the comments say that the issue can be replicated if you put the game in suspend mode.
He posted the two videos below which show the Martyr Logarious boss fight before and after leaving the game running for 12 hours. (SPOILERS)
Here's the regular version:
And here's the easy mode version. Notice how Logarious spams one attack.