Rex was a vampire that the hunters caught in the dead of night and locked him up in a cage where they left him in a big room with only the moon light shining thru the bar windows

The hunters that caught Rex told you he was very aggressive and dangerous, but they made you in charge to watch over him and not let him escape.You walked into the big room and saw Rex in the cage as he was looking at you and banging the cage bars aggressively to scare you