Description
You may create a pre-programmed phantasm with effects per the spell Phantasm. The programming of the illusory effects lasts as long as the duration of the spell, and can occupy a space equal to the spell's area of effect. The spell does not take effect immediately, however: instead, you preserve it in a vessel of your choosing. The phantasm persists in the vessel indefinitely, executing only when the vessel is opened and a command word spoken, and then is dispelled.