Sphinx

The Sphinx  is a large creature with a monstrous face hidden behind a human mask and a body combining traits of a dog, a lion, a bird, and a snake. In addition to possessing great strength and the ability to fly, the Sphinx has the ability to drain the theta waves from the brain of whoever answers its riddle incorrectly, taking away all their thoughts. It does this by removing its mask and attaching a long green tentacle from its face to their head. However, it can't use this power if its victim doesn't let it ask them the riddle first or if they get it right. If the victim gets it right the Sphinx starts molting.