Your Eldritch Blast takes on a form more befitting of your patron (You cannot know both Eldritch Blast and this spell and any Eldritch Invocations that augment your Eldritch Blast instead augment this spell). You weave into being an illusion of some form of short-term phenomena that fools the senses but is perceived by only the target. It might be an intense flame, a flash of lightning, or some other similar effect. The target makes an Intelligence saving throw, and on a failed save takes 1d8 psychic damage from the perceived harm.
Alternatively you may create a non-harmful illusory effect such as an object or sound, though images created in this way must fill no more than a 5 foot cube. Such an illusion is still perceived only by your targets and can be foiled by an investigation check against your spell save DC, or by physically interacting with it. The illusion lasts for one round before it begins to fade but you may prolong it by casting the spell again on your turn, and may change its parameters when you do so (such as causing it to move or even attack its targets).
The spell's illusion is visible to more targets when you reach higher levels: two targets at 5th level, three targets at 11th level, and four targets at 17th level. The target's share the same illusion.
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