I find that a trip or two to Selvadorada usually supplies my revenge needs for a playthrough. You can do some pretty nasty non-lethal things to sims with those artifacts. You can do a lethal thing too, if watching them suffer isn't enough.
Of course what I also liked to do for sims that belonged to households with multiple people was to enter the home, call the target sim into a seperate room, ward the door with my vampire powers, then place fireworks in the other room, set them off and run, allowing the target sim's family to meet their demise before putting out the flames myself and heading home. That'll learn him.
Yes, the sim you are playing can die as well if you are not careful. High risk, high reward. You flick my ear, I burn your house down with your loved ones inside. Seems reciprocal.
