Malefica -

This is the most feared power of the Malefica. By tying a "witch's knot" (a cord with three or nine knots) and speaking a curse, she could render a man physically unable to consummate a marriage. The Catholic Church had a specific ritual of exorcism—the exorcismus contra maleficium —to untie these knots.

: She is instantly recognizable by her iconic horns, sharp cheekbones, and ability to transform into a dragon—a cinematic favorite for many creators like Guillermo del Toro . Malefica in Science and Branding Malefica