Disharmonious Emperor Form

Disharmonious Emperor/Empress Form is the upgraded form attained by the villains (excluding Tirek, Chrysalis, and Nazo). They first attained this form in The Ending of the End (Sonic: Adventures in Equestria).

Transformation Sequence
They first use the Bewitching Bell as a pale cyan aura surrounds them, followed by a storm of black crow feathers, surrounding them all. Two seconds later, the aura disappears, revealing each of the villains in their Disharmonious Emperor/Empress forms.

Trivia

 * The villains' forms look similar in a combination of the Trix's Disenchantix, Dark Sirenix, and Dark Witch forms from Winx Club.