Dread Powers are the unique powers and abilities possessed by horrors (monsters and other supernatural beings) in the Chronicles of Darkness. First introduced in Hunter: The Vigil, they were integrated into the Storytelling System's core rules in the Chronicles of Darkness: Revised Storytelling System Rulebook.
Dread Powers are kept somewhat generic in textual flavor when compared to other traits, as they are meant to be used to provide a framework for the Storyteller when designing antagonists and other unique and/or monstrous storyteller characters. Normally, traits would be more specifically defined (such as Numina) so that they could be at least theoretically usable by the player characters or their allies.
In Hunter: The Vigil, Dread Powers are assigned a dot-based rating, not unlike most supernatural beings' powers. In the Revised Chronicles of Darkness rulebook, Dread Powers follow the framework of Merits: most Dread Powers are binary, where a Horror either does or does not have any given Dread Power, although a few are given variable dot ratings (not always from one to five dots).
The Strix also possess their own suite of unique Dread Powers that follow the Merit-like framework; their powers were simply called "supernatural powers" when they were first introduced in Requiem for Rome, and were given the "Dread Powers" appellation in Night Horrors: The Wicked Dead and later Vampire: The Requiem Second Edition.