Sandman

Raven, Jules, and Ruby Wings were three eighteen year old sisters: adopted by the now deceased Jay and Robin Wings.

The girls have the ability to each control one element: ice, fire, or earth. And each of them can do something else: transform into an angel, a devil, or see and speak to the dead.

One dark night the girls are at the park and are confronted by the Sandman, a large blacker than black monster dripping with green ooze. It has a large mouth and no eyes.

They have to kill every person on the Sandman's list in one month or they themselves will be slaughtered.

"Tick tock tick tock" the low throaty growl came from its open mouth, he reached out and placed his hand on Raven cheek, it was wet with tears. He leaned in until they were inches apart "You've got 24 hours left, better not let it go to waste"