Let's go with a monster; haven't seen one of those in this thread for a while:

Dream Vestiges are the result of a city's worth of people becoming trapped while dreaming, banding together, and returning hungry for... well, everything. Fans of the Wheel of Time series will recognize the influence of Mashadar in its design and powers (though honestly, as a CR 16 incorporeal undead with no-save ability damage and the ability to absolutely consume its prey... it's still less powerful and intimidating than Mashadar. More intelligent, though).

Now I kind of want to use Symbiotic Creature to recreate Padan Faine.