Two figures floated towards each other as the ground froze beneath them. Bony fingers clasped. Open mouths that could suck the very soul out of someone met. The mist surrounding the figures became thicker as the robes tangled together.
As the mouths pulled apart, out of the depths of their mouths came two tiny beads of light; two souls that had been sucked from their previous owners just hours before. With the joining of lips by a fellow dementor the souls took on the very form of a dementor, creating another creature that could destroy others at will. And the fog became denser.