Possible Clues:

• Monster killable with a silver bullet
• Dam, some say, with northward current -- it's monstrous!
• Beast of some horror movies
• Monster in dread, wiping out a climbing plant
• Fair amount of dandelion, for example, beside Crocosmia Lucifer, for instance, raised by a beastly monster
• A monster we love, contrarily
• Full moon shape-changer
• Lycanthrope, a person believed to change into a wild animal for a time
• Man-beast howling at the moon
• Full moon howler