Nightsisters

How to beat:
 * 1) Focus weakest nightsister first to get past first two auto-revives, or Dakka is not much difference in health to weakest. Ventress is also a good target because she gets stronger if you kill her allies
 * 2) Buff immunity or dispell Zombie. Fracture prevents revives if you have Thrawn
 * 3) Then Dakka
 * 4) Then Talzin or Ventress