The Heart of Meridian is one of the Hearts (including the Heart of Kandrakar), the rarest and most important artifacts of great power, and the very cores of the worlds within the W.I.T.C.H. universe. The Heart also once worn by the royal family that ruled Meridian for generations before it disappears into obscurity during the time when the young Prince Phobos grew mad with power, stole the throne from his parents and corrupted the land with his powers. Nerissa then incorporated the Heart of Meridian with the stolen Heart of Zamballa into her accursed sceptre known as the Seal of Nerissa.