13. Illusory Corridor

Regardless of which door is entered: Turning the corner, you see a long corridor stretching out before you. If anyone attempts to proceed down the corridor, the GM should roll a save vs. Spells for all such characters. All who fail will experience the corridor going on forever, but this is an illusion. Those who succeed will suddenly realize the true shape of this space. Even if characters go in both doors, they will have the same experience; someone entering from one door will neither see nor hear those entering from the other. Only advancing into the corridor and making a successful saving throw will reveal the truth and allow the character who saved to see those trying to approach (and at this point, the character who saved can actually move forward and join the others, appearing from thin air from their perspective). Turning back after advancing into the illusion grants a second saving throw; if this one fails, the character will believe it takes them just as long to return as they spent "advancing" into the illusion.