每个夜晚，当白天若没有玩家死亡，丧尸选择一名玩家，将他杀害。当丧尸第一次死亡时，丧尸仍然活着，但被视为死亡。
丧尸被处决后，他会被说书人宣告死亡，实际上他没有死，他也无法在今晚选择杀死一个玩家。随后游戏进行到表面上只有两名存活玩家时仍然不会结束，直到真正只剩下两名存活的玩家为止（包含丧尸只剩下两人）。
某天白天没有玩家死亡，所以当天晚上丧尸选择袭击一名玩家并杀死了他。
某天白天修补匠因为自身技能死亡，这一天的夜晚，丧尸无法使用自己的能力。
The sinister Zombuul is the deadliest Demon in Bad Moon Rising for its stealth and survivability. The Shabaloth and Po may kill many and the Pukka may strike with their poison, but they are all disappointingly fragile when the town eventually uncovers them. Not so for you - you're hard to find and harder to kill, and your patience is legendary; you're content to lie among the dead and listen peacefully as the town tears themselves apart looking for a Demon among the living, not ever suspecting that one of the rotting corpses in the graveyard still draws breath. The good team should pray you're not the Demon they're facing, because then no player is safe; the dead and the living alike are all equally and terrifyingly suspect.
You only have the ability to kill at night if nobody has died during the day. This can be difficult, since even though players are dying, it is primarily the good team that is killing them, meaning that a troublesome Exorcist or Courtier hovering around may continue to survive when you badly need them gone. One way to work around this limitation is to speak up for no executions, but the good team may find that suspicious and start questioning your allegiance if you push for that too often. A more reasonable strategy is to encourage executions that you don't think will cause death - for example, a Sailor claim, or the neighbours of a Tea Lady. This gives the good team information, but will also grant you your precious kill... providing the Tinker doesn't drop dead in the middle of the day, anyway. You could also (probably only once) argue for a Mastermind, leveraging the good team's paranoia about whether or not they killed the Demon to have them hold off for a night rather than risking losing the game.
Kill yourself, and hide in plain sight as a dead player! This can be especially effective if the good team thinks a different Demon is in play, since they will ignore the dead as suspects and focus on the living. Even if they do suspect you, choosing to die at the right moment can throw them off your trail - for example, get yourself executed early to "test" your Sailor immunity, and blame a Pukka for your death. Alternatively and more simply, you can just choose yourself and die at night - players who die at night tend to be good and considered trustworthy. Finally, you can coordinate with your Godfather to take you out at an opportune time, making it look like there isn't a Zombuul in play and that you are an innocent victim of circumstance. Then, you can use your death as a platform to spread misinformation and confuse the good team... or simply sit back and watch the game unfold.
Rather than dying early, you can instead decide to be a sophisticated undead who lives among the people and lives as long as possible! Surviving this way has several advantages - for one, you can keep bluffing and giving out new information, helping mislead the good team. You're guaranteed to survive death at least once, so you have a backup in the event that suspicion turns on you. Finally, if the good team starts to suspect that you are the Demon in play, you can direct their suspicions to the dead - if they spend an execution or two on your victims, that's an execution or two they can't use on you!
Pay attention to when and why death happens. If there are deaths at night, but not after a player died by execution, you almost certainly have a Zombuul in your midst. Once you know this, you can do the following...
Suspect the dead. Execute the dead you suspect the most. Talk to the dead to find out whose story is not making sense, and focus on those players. You don't know for certain that the Zombuul is among the dead players, but that is a good place to start. If you can confirm early on that certain dead players are not the Zombuul, you'll have the advantage later in the game.
Execute every single day. Even if you kill good players, at least that is better than executing nobody and having the Demon choose who dies instead.
On the final day, the chances of the Zombuul being among the living is very unlikely. By this point, most Zombuuls will have killed themself at night, or simply been unlucky enough to be executed. Since the Zombuul kills much less frequently than other Demons, the chance that it is already dead when the final day dawns is high. If you have no other information, make sure that the final execution of the game is the execution of a dead player.