4th-level Enchantment

Casting Time: 1 action
Range: 60 feet (20-foot square)
Components: V, S, M (a small mirror ball)
Duration: Concentration, up to 1 minute
Class: Bard, Wizard
Sourcebook: L’Arsene’s Ledger

You attempt to force creatures in a 20-foot square centred on a point within range into a dancing frenzy. Each creature in the area when you cast the spell must succeed on a Wisdom saving throw or suddenly engage in synchronised choreography, perfectly mimicking the movements of each other affected creature with flawless timing. An affected creature must use all of its movement to dance without leaving its space, and has disadvantage on attack rolls and Dexterity saving throws. Other creatures have advantage on attack rolls against a dancing creature. As an action on your turn, you can further control affected creatures, forcing all of them to immediately use their reaction to move up to 15 feet in a direction of your choice, potentially triggering opportunity attacks. An affected creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.