As Unseen/Cult you need to eliminate the BD majority as fast as possible. As NK you need to do the same. This simple fact can allow for team play between the 2 even when they are on different teams
Capitalizing on statuses
If someone is poisoned that tells the NK 3 thing’s.
1: They are not Unseen right now
2: A healer is visiting them
3: No other types of defenders are on them
There are many ways of using this as an NK
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Reaper:
In a Reaper game the Unseen/Cult should try to poison someone high priority such as the prince or Psychic. Given this someone being poisoned is a good kill opening for them. Since reap ignores heal the phys/Alch won’t help and given how reap works it will seem like they were never healed. The poison itself means that if they are a hunter they won’t bear and a knight won’t be on them. -
Possessor
In a Possessor game the Unseen should poison low priority targets when a high priority target is known. The poss can send someone to attack the high priority target and kill themselves and the Knight that would guard instead of the phys. -
Sorcerer
In a Sorcerer game you want to alternate. Start by poisoning a high priority target. Sorc CoD the poisoned target and kills the healers. Then Unseen poisons someone less important and sorc CoD the important person again to kill the other Supports like Knight’s and CW’s.
Communication
First thing you should do in you DN as either team is state your willingness to cooperate early on. After that you need a method to communicate. One way to as unseen if you find the NK to just whisper him. This can work best but DN’s are useful too. You want to use codes if possible. This means that you should whisper the NK a code number once and then use DN’s. You should always try and do this when you expect the whisperer is going to die soon.