You create a sound or an image of an object within range that lasts for the duration. See the descriptions below for the effects of each. The illusion ends if you cast this spell again.
If a creature takes a Study action to examine the sound or image, the creature 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 illusion becomes faint to the creature.
Sound. If you create a sound, its volume can range from a whisper to a scream. It can be your voice, someone else’s voice, a lion’s roar, a beating of drums, or any other sound you choose. The sound continues unabated throughout the duration, or you can make discrete sounds at different times before the spell ends.
Image. If you create an image of an object—such as a chair, muddy footprints, or a small chest—it must be no larger than a 5-foot Cube. The image can’t create sound, light, smell, or any other sensory effect. Physical interaction with the image reveals it to be an illusion, since things can pass through it.
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Posted Nov 11, 2025Blindsight can make you immune to the effects of certain Illusion spells, yes, but that's a property of those spells, not of Blindsight itself, and doesn't apply to spells like this one that don't explicitly have it. Blindsight doesn't provide any special ability to detect that an illusion someone is attempting to pass off as real isn't real.
A Blinded creature can't see anything, regardless of whether it's an illusion or not. A Blinded creature that has Blindsight would see the illusion if it's within their Blindsight range, but has no special means of detecting that it's illusory.
That does not seem logical to me at all; Blindsight is not a physical interaction. Again, being able to see through illusions is a property of Truesight, not Blindsight.