After defeating an akumatized villain, Ladybug throws the object she got using Lucky Charm into the air, yelling "Miraculous Ladybug!" This generates an explosion of pink energy, eventually dispersing into small ladybugs that go around Paris and fix any damage done since the appearance of the villain, including reverting death.
While using Lucky Charm causes Ladybug to start losing power, using Miraculous Ladybug does not, it being an optional power she can use before she detransforms.
In the Korean version, the Miraculous Ladybug is called "Miraculous Healing Light."
The Miraculous Ladybug not only fixes the villain's damage, but usually also fixes the damage done by Cat Noir's Cataclysm and other general problems; for example, it fixes Alix's broken watch and rejoins the double Ladybugs and Timebreakers caused by time travel in "Timebreaker".
When the Miraculous Ladybug comes out of the Lucky Charm object, it makes the shape of the Wheel of Life.
The power of the Miraculous Ladybug is only limited to the apparition of the akumatized villain and can even revert death within that time.
To summon the Miraculous Ladybug, Ladybug always throws in the air the object summoned by Lucky Charm, even when it is impossible for her to retrieve it:
The coin used in the vending machine in "Mr. Pigeon".