But while all of this should be enough to earn an early retirement, the world had other plans for poor Gabriel (which, coincidentally, were the perfect length for some Lords of Shadow DLC). It seems the Lords of Shadow were keeping an even greater evil known as the Forgotten One under wraps in Carmilla's old castle. Sensing his return, Laura, the young vampiress, calls for Gabriel's help. The two decide that their best bet is to send the experienced demon hunter into the Forgotten One's dimension, but there's a catch--only dark beings can survive the journey.
This gives Gabriel the oh-so-enviable task of drinking Laura's blood to absorb her power, killing her and turning himself into a full-on vampire. It doesn't, however, seem to be enough, as the demon's suppressed state is still too much for him to handle. Gabriel waits until the Forgotten One destroys a seal containing the majority of its own strength before stealing the dark power away from the demon's grasp and claiming it as his own. His transformation complete, Gabriel slays the Forgotten One, claims Carmilla's castle, and sheds what little was left of his humanity.