As stated, pull up the characters & read the ability descriptions to get a full detail but here is the basics.
1. Zombie will always Auto-Rez herself as long as another NS is alive.
2. Daka will always Rez other NS with her special.
3. Zombie will sacrifice herself, and then Auto-Rez herself, to resurrect the first 2 other NS deaths but only the first 2 times another NS dies, any of them, or the same one twice, but first 2 deaths Zombie will Rez them.
**NOTE: Don't bother trying to CC Zombie any more than a dispel of taunt. When she sacrifices any debuffs are gone when she Auto-Rez herself.
4. When Zombie dies she gets a slow down debuff, after 2 deaths in a row she gets REAL slow.
So basic strategies to kill them are listed previously by others.
My normal strat is to see if 1 NS happens to look a lot weaker than the others.
If so, then dispel taunt if you can & kill that weak NS 2x in a row to get through Zombies freebies.
Also, look to Crowd Control Daka somehow, Stun/Fracture, etc etc.
Her Heals/Stuns/Rezes get annoying when your already dealing w/ Zombie & weakest NS.
Once Zombie is slow, and Daka is CC'd, & some NS has been killed 2x, the hard part is over.
At that point just kill Daka & the rest then finally Zombie again.
They are a pain & as stated, teams that have AE's & lots of assists are a Huge plus.