Plague Inc. Wiki
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Dark Night is a symptom combo exclusive to the Shadow Plague DLC. The player can get this combo by evolving Corrupted Air, Night Wraith and Dark Infiltration.

Symptom Combos in Plague Inc. and Plague Inc: Evolved.
AssassinBath TimeBlind GeniusBlood in the AirBoomerCarpe JugulumCranial DispersionDiscovery ChannelFly MagnetOn The Naughty ListOopsProfuse BleedingProjectile VomitingPublic DefecationRed Ape RedemptionRed RainRude AwakeningRunnerSpitterSwine FluTankUltimate ChristmasVampire BatWalking ContradictionWalking DeadZombie Panic
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