[Endoperez]

Vampire Queen isn't great because of equipment, but because she can use so many buffs.

If you have a Vampire Queen with Earth for Iron/Steel Skin or Invlunerability and possibly Earth Power (reinvigoration), Air for Mistform and/or Mirror Image, Water for Quickness and/or Breath of Winter, Fire for Fire Shield, starting with death so cheap access to Soul Vortex... And keep in mind, some of those are easily gotten from very cheap items, like Luck and Quickness. She can also drain life without items. So, you can use her as a suicide-bomber, destroying all and everything on your dominion (Cloud Trapeze and her initial Flying help a lot), or equip her properly to have SC with all(?) possible buffs.