I'm probably missing something but....

https://swgoh.gg/characters/nightsister-zombie/

Level 8
Nightsister Zombie can revive after being defeated at -100% Speed from Endless Horde. While a Nightsister ally is active, the first 2 times another Nightsister ally is defeated by an enemy attack, they are revived, recover 100% of Nightsister Zombie's Max Health and Nightsister Zombie is defeated. When Nightsister Zombie is defeated by this effect, she loses all Protection, dispels all negative Speed effects from Endless Horde and revives with 50% Turn Meter. This effect does not trigger Endless Horde's Speed reduction.

2 different strategies:

A.
Kill weakest non-zombie NS twice.
Then kill Daka, Talzin/Asajj, 5th NS - then Zombie last.

B.
Kill weakest non-zombie NS twice.
Kill zombie repeatedly until at zero speed (2 stacks of -50% speed).
Then kill Daka, Talzin/Asajj, 5th NS - then Zombie last.

"HK666;c-1844631" wrote:
what I do-
kill av twice, kill daka, kill talzin/av, clean up. preferably kill zombie as few times as possible throughout the ordeal

Sith (palp or Traya) and imp troops are good counters. I haven't tried using imp troops against a solid NS team yet, but it's a well known counter. Traya is probably overkill, tho it's easy to mess up with Palp and I use Thrawn if I'm bring Palp

Another counter is a Zeta'd Carth Onasi lead, w/ Mission, Zaalbar, Canderous, and another KOTOR unit or a good DoT unit, like Sidious or Vader

what I do-
kill av twice, kill daka, kill talzin/av, clean up. preferably kill zombie as few times as possible throughout the ordeal

Sith (palp or Traya) and imp troops are good counters. I haven't tried using imp troops against a solid NS team yet, but it's a well known counter. Traya is probably overkill, tho it's easy to mess up with Palp and I use Thrawn if I'm bring Palp

I take out weakest non-zombie out twice. Them Daka, Ventress, Talzin and the last one before finishing off zombie.