To slay a monster, denotes that you will successfully cope with enemies and rise to eminent positions.
Dreaming about monsters and demons is very common.
They may represent negative forces inside of yourself and in your life. Most of the monsters are representing your own negative characteristics and tendencies.
The way that you deal with the monster in your dream is generally symbolic of the way you are dealing with the corresponding negativity in your daily life. If you wake up from this dream and are very frightened, just remember that your mind created those images and that their purpose is to teach you something about yourself.
Dreams about monsters come from repressed emotions.
The monster may represent a side of your personality that makes you uncomfortable. This dream often means that you would do well to consider a change of direction, or give up a bad habit that’s unhealthy for you.