Pandora (Book of Monsters)

Pandora is a shape-shifting monster and the main atagonist from the 2018 movie called Book of Monsters, and she'd played by an actress named Steph Mossman.

History
At the start of the film she was responsible for killing Sophie's mother because she's a monster hunter and that's why Sophie kept relieving these nightmares for almost 10 years.

Speaking of which as we fast forward to 2018 she'd managed to seduce a male party guest to a room in where she'd used him for an occult ritual thanks to a certain someone for leaving a monster book in the room, and she'd manage to release a monster-like plague doctor, a pair of sentient slugs, Grota and Jinn.

As we'd reach to the end of the movie she was battling Sophie as she'd trapped Jess in a web-like cocoon on the bed, and in the last ditch effort she'd distracted Sophie with a vision of her dead mum, but instead Pandora was then killed by Sophie who was wielding a chainsaw.