67TacoShells

The police officer sees a car swerving to and fro, driving like an absolute madman, so of course, he stops the car. To his surprise, he finds who else but father Duffy at the wheel. "Father Duffy, have you been drinking tonight?" "Oh no, not a thing" "Well I'm going to need you to take the sobriety test anyways" "Oh don't you worry, I'm fine!" Unsurprisingly, the priest completely fails the test, falling flat on his face, dropping his flask on the ground. "Father Duffy, do you mind if I look inside this flask here" "Oh go ahead lad, it's just water" Sure enough it was wine. "Are you sure about that sir? It smells positively of wine to me" "My, a miracle! The good lord's done it again!"

New DM here, just two sessions under my belt. How should I determine the difficulty of an encounter? I have nine level two players. (I know it's too much, but I really suck at turning people away.) Is there some formula to follow? I know monsters have Challenge levels, but I don't know how to apply it.