The high vampire boss fight has been the thorn in my Mastercrafted ... daring me to finish what I'd started. Imagine my surprise when I loaded back in and realized that maybe Dettlaff wasn't ...

As a result, the hardest Dark Souls bosses end up becoming the best part of the experience, allowing players to apply everything they've learned over the games to show their foes who's boss.

Additionally, this key is only found if players have Isma’s Tear. These grueling bosses make up the hardest boss fights of the metroidvania genre, putting the players to the ultimate test.