If you want nightsisters to really work (specifically, the cheese), you need Talzin's lead and Merrin's Omicron. Here's how it works... 1) Merrin's omicron (among other things) gives her 100% TM any time an ally is revived or defeated. 2) Whenever a nightsister uses a basic attack, Talzin's lead zeta revives a dead nightsister, they use a basic attack, and then they are defeated again. Talzin's leadership counts as a revive and a death. Each revive and death gives Merrin 100% TM. So, if you can make it happen, once Talzin is dead, Merrin can literally just use her basic infinitely in a 100% TM loop. Every time Merrin basics, it will revive then kill Talzin, which then gives merrin 100% TM, and she can keep using her basic over and over in this way. BUT IT ONLY WORKS WITH BASICS. You can screw it whole thing up by using a special. Once an ally on that team dies, you can ltierally basic spam your way to victory. You just need ot make sur eMerrin isn't the one who dies. This is why in 3v3 people choose to use Daka, Talzin, and Merrin. If you get bad RNG and Merrin dies first, Daka can just revive her until another NS dies. If Daka dies first, who cares, Merrin gets 100% TM and now Daka is the one coming back to life each turn, potentially stunning 2 enemies, while Merrin uses her basic. If Talzin dies, same thing as Daka, Merrin can just use her basic TM loop. And oh, by the way, if you also have Daka's unique zeta, she gains 10% max health every time an ally is revived... which is now every single turn that merrin is using a basic, reviving Talzin.
If you want nightsisters to really work (specifically, the cheese), you need Talzin's lead and Merrin's Omicron. Here's how it works...
1) Merrin's omicron (among other things) gives her 100% TM any time an ally is revived or defeated.
2) Whenever a nightsister uses a basic attack, Talzin's lead zeta revives a dead nightsister, they use a basic attack, and then they are defeated again.
Talzin's leadership counts as a revive and a death. Each revive and death gives Merrin 100% TM. So, if you can make it happen, once Talzin is dead, Merrin can literally just use her basic infinitely in a 100% TM loop. Every time Merrin basics, it will revive then kill Talzin, which then gives merrin 100% TM, and she can keep using her basic over and over in this way. BUT IT ONLY WORKS WITH BASICS. You can screw it whole thing up by using a special. Once an ally on that team dies, you can ltierally basic spam your way to victory. You just need ot make sur eMerrin isn't the one who dies.
This is why in 3v3 people choose to use Daka, Talzin, and Merrin. If you get bad RNG and Merrin dies first, Daka can just revive her until another NS dies. If Daka dies first, who cares, Merrin gets 100% TM and now Daka is the one coming back to life each turn, potentially stunning 2 enemies, while Merrin uses her basic. If Talzin dies, same thing as Daka, Merrin can just use her basic TM loop.
And oh, by the way, if you also have Daka's unique zeta, she gains 10% max health every time an ally is revived... which is now every single turn that merrin is using a basic, reviving Talzin.
I'm missing Merrins Omicron, but she sounds like a worthwhile investment