The Apple

The Apple is a representation of a signal the creator of a given dreamscape emits. When traveling into someone else's dreamscape, the individual who created that dreamscape will always appear to be in possession of an apple. If anyone bites this apple, they can be transported back to the dreamer's reality. Normally, this is merely a method for lucids to wake up and/or emerge from lower dreamscapes. However, if the person biting the apple is not from the given dreamscape, any stress can lead to neural feedback. This can lead to side effects ranging anywhere from upset stomach to death.