You create an
Illusion of an object, a creature, or some other visible phenomenon within range that activates when a specific condition occurs. The
Illusion is imperceptible until then. It must be no larger than a 30-foot cube, and you decide when you cast the spell how the
Illusion behaves and what
Sounds it makes. This scripted
Performance can last up to 5 minutes.
When the condition you specify occurs, the
Illusion springs into existence and performs in the manner you described. Once the
Illusion finishes performing, it disappears and remains dormant for 10 minutes. After this time, the
Illusion can be activated again.
The triggering condition can be as general or as detailed as you like, though it must be based on visual or audible
Conditions that occur within 30 feet of the area. For example, you could create an
Illusion of yourself to appear and warn off others who attempt to open a trapped door, or you could set the
Illusion to trigger only when a creature says the correct word or phrase.
Physical interaction with the image reveals it to be an
Illusion, because things can pass through it. A creature that uses its
Action to examine the image can determine that it is an
Illusion with a successful
Intelligence (Investigation) check against your spell save DC. If a creature discerns the
Illusion for what it is, the creature can see through the image, and any noise it makes
Sounds hollow to the creature.