Heart of the Night

a phantom is guaranteed to be in one of the underground temples with traps, and as for the weeks, I'm not sure. But if you think about it, half of the weeks can affect the gameplay, and that's part of the game. Besides, unpleasant things like plague/fever don't affect the reinforcements from the dwellings, which become the main source of troops. The specific situation you encountered can simply be waited out; the time on the map until Baal awakens doesn't affect anything.