Creatures of everlasting darkness. These creatures are the only things born evil.
Just being in proximity with a dementor drains all happy thoughts away from. They make you relive your worst memory.
They also take away anything warm, whether they be thoughts or the accual tempature.
They are also some of the only creature that do not sleep, they also never walk. They are the only known creature that can suck the very soul from a living thing.
Because of these special abilities they are used as gaurds to the wizard prizion of Azkaban
The only know way of fighting a dementor is to use a petronus charm.
When thoses Dementors came by..........i nearly pissed myself.