undead plague in the city, but my players are too high level to be challenged by zombies, which seem appropriate. they're all 6th level. wights? ghouls? ghasts? i suppose a whole buttload of ghasts would work. when the necromancer cult who started it finally shows i can whip out the big guns and hit them with red dragon skeletons and frost giant zombies... but for now when there's just this plague of undead contagious undead they have no reason for yet... what do i go with?