The Miracle Crown is a major antagonist in Cloud’s Forum Adventures. Hence its name, it is a sentient crown that possesses its wearer and imbues them with incredible power.
The Miracle Crown first appeared in Season 5’s “The Miracle Crown Frenzy”, where it possessed Cloud, turning him into Miracloud. After Cloud was freed from the crown’s corruption by Spectra, it temporarily consumed Megar and used its newfound power to freeze Earth. The Miracle Crown later lured Cloud, Megar, and Spectra to its castle in the sky, where it fused with the latter and became the Miracle Core.