4. Illusionary Pit

This room appears entirely empty. Whoever steps on the pit space will perceive it opening up and dropping them 10 feet. A successful saving throw vs. Spells will allow the victim to resist; otherwise, they fall to the floor and suffer 1d4 points of damage. Those not affected by the pit will not see it, and will only know the victim or victims yelled in surprise or fear and then suddenly fell hard to the floor. The illusionary pit will activate every time the space is entered, but those who have already saved against it successfully automatically resist. All others must save or suffer the effects.