This guy is a VT-IT Drk, and will use Blood Weapon at 50% HP. 2-hours are completely unneccessary - he goes down fast as long as your DDs are good. As a BLM/Rdm I took him on briefly with Shock spikes up (as a side note, watch where you put your Firagas during the last wave ><), and he was hitting for less than my average Ballista opponent, about 30-50 a swing (whenever he wasn't Stunned XD ).