Taigle's Ticklish Terror

You target a creature within range and assault them with phantasmal tickles in all of their most sensitive areas. The target must make an Intelligence saving throw, resisting the effect on a success. On a failure, the target's movement speed is halved and they gain disadvantage on all saves (and start laughing loudly) until the spell ends. They may repeat this save (with disadvantage) every round. If the spell lasts for the full duration, the target gains 1 level of exhaustion. A creature that has had the spell cast on them is immune to any more casts of it for 24 hours after.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, you can target 1 additional creature for each spell level above 3rd.