Anathema..?

A Burly Beelzebub, 

Fell for a charmingly naïve soul,

Got Anathematize!..

Metamorphosed herself into a Serpent,
Epidermis began sloughing.
Fangs began falling.

Head of hair began smouldering.

She's limp and weak,
Stubborn as a mule,
A Doomsayer,

Capitulated her powers to a brute,

Didn't even have the vigour to combat anymore.
She turned to cinders and flee away forever...