I'm running a published adventure that includes a male human terkow rogue as a monster. His melee attack stat is: 3 claws +17 (1d6+4/19-20 plus grab). His Special Attacks stats include blood drain and energy drain (2 levels, DC 19). However, no rules are provided in the adventure to indicate when the monster can use blood drain and energy drain.
Is the notion that I can make an energy drain attack using a melee attack, but instead of physical damage, I drain 2 levels from the PC? Am I supposed to assume that blood drain and energy drain just use a base attack bonus for their attack?