Feyr

In the Dungeons & Dragons fantasy role-playing game, the Feyr (pronounced "fear") is a fictional monster formed when residual magical energies combine with ordinary nightmares. In appearance it resembles a large human brain, with a ragged mouth full of teeth and many tentacles for walking and grabbing at unwary travellers. Owing to their conception, feyrs are found most commonly in places where large numbers of magic-users gather, such as cities. They come out mainly at night, haunting back alleys and other out-of-the-way places. Feyrs have a limited magic capability.