Tag's Illusory Dance

You summon illusory fireflies surrounding your character, filling the 30-foot radius sphere with you at the center. Illusory fireflies move in a dance-like pattern creating shapes of people's figures dancing.
Each other creature in the area who sees this dance must make an Intelligence saving throw. On a failed save, the creature becomes Incapacitated for the duration.

At the end of each of the target's turns before the spell ends, the target can make an Intelligence saving throw to break out of a stupor.