You can enter a flow state of Dance as a Bonus Action if you aren't wearing Heavy armor. Your Dance lasts for 1 minute, or until you have the Incapacitated condition, your Speed is 0, or you choose to stop dancing (no action required).
You can begin your Dance a number of times shown for your Dancer level in the Dances column of the Dancer features table. You regain one expended use when you finish a Short Rest, and you regain all expended uses when you finish a Long Rest.
Dance Die
Your dancing prowess is represented by a Dance Die, which is a d4. This die changes when you reach certain Dancer levels, as shown in the Dance Die column of the Dancer Features table.
Graceful Dodge
If a creature you can see hits you with an attack while your Dance is active, you can roll your Dance Die and add it to your Armor Class against this attack, potentially causing the attack to miss you.