You create the image of an object, a creature, or some other visible phenomenon that is no larger than a 20-foot cube. The image appears at a spot that you can see within range and lasts for the
Duration. It seems completely real, including
Sounds, smells, and
Temperature appropriate to the thing depicted. You can't create sufficient heat or cold to cause damage, a sound loud enough to deal thunder damage or deafen a creature, or a smell that might sicken a creature (like a troglodyte's stench).
As long as you are within range of the
Illusion, you can use your
Action to cause the image to move to any other spot within range. As the image changes
Location, you can alter its
Appearance so that its movements appear natural for the image. For example, if you create an image of a creature and move it, you can alter the image so that it appears to be walking. Similarly, you can cause the
Illusion to make different
Sounds at different times, even making it carry on a conversation, for example.
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 its other sensory qualities become faint to the creature.
At Higher Levels: When you cast this spell using a spell slot of
6th Level or higher, the spell lasts until dispelled, without requiring your
Concentration.