Nightmares

Nightmares are single-minded entities that only target those who created them. They don't aim to kill their victims. Instead, what they want is to cause the person to relive the fear they embody. A person caught by a nightmare is pulled into the nightmare's body, where they're forced to live through their fear endlessly.

Each nightmare has a weakness specific to its core concept, and thus a different method of overcoming. A nightmare that embodies teeth falling out might have to be glued in place, while a nightmare that embodies mocking laughter might need to be gagged shut. Overcoming a nightmare diminishes its hold on you; by exploiting its weakness enough, you can eventually break free of that nightmare once and for all.

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Planeswalker's Guide to Duskmourn