went down to Veksar with my 56 necro. i was using the lvl 49 pet, and his top hit was around 55. eventually he bit the dust and i decided to Levant back to the entrance and try charming. using Thrall of Bones and Augmentation of Death, i charmed the first undead i came across, a Sentry. his top hit was around 120. these mobs are beasts when charmed. sic pet, slow mob, cast BoD, a dot, and root, and sit back while the pet kills the mob in 1 minute or less. this was great until i decided to charm the Duke that hangs around near the water entrance that leads to the tougher undead areas and the golems. his top hit was 194, dual wielding steel hammers. he's marvelous until he breaks charm, at which point, i would feign death, wait to lose aggro, and run down and charm him again. XPs are pretty slow at 56, but with a charmed mob, they speed right up.
good luck necros