The monster may represent a talent or idea you believe others will invalidate or that will not be understood.... Ariadne's Book of Dream
To slay a monster, denotes that you will successfully cope with enemies and rise to eminent positions.... Ten Thousand Dream Interpretation
The monster in your dreams could be your fear, bad temper, negativity, smoking habit, or anything else that is hurtful and needs to be changed.
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.... The Bedside Dream Dictionary
2- When, in everyday life, events get out of proportion we often have to suppress our reactions. In dreams we cannot do this and so our minds create some way of dealing with the problem. Often the colour of the monster (see Colour) will give us some indication of what the problem is, thus a red monster would indicate anger (possibly uncontrolled), whereas a yellow one might suggest resentment.
3- Fear of death and all that goes with it.
A monster can highlight a more childlike fear, and can be looked at thus.... Ten Thousand Dream Dictionary
Slaying a monster: Becoming the hero for your own life; transforming fear into victory and creativity (see Sword).
Repressed drives and ambitions that need to be expressed.... The Language of Dreams
If we vanquish the monster, it is said that we must take care not to kill it, since we may be killing off part of our personality. Equally it should not be allowed to overcome us; self-survival kicks in and we will normally wake up before it does.... Dream Meanings of Versatile
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.... My Dream Interpretation
Talk to the frightening monster in your dream, have it out with him and observe him.
Mythical creatures, like dragons and ocean monsters, point to moral conflicts that may cause personality disturbances. Seek therapeutic help when these images appear often and include a great amount of fear.... Little Giant Encyclopedia
If you killed the monster in your dream, you will successfully deal with your personal issues and rise above them.... My Dream Interpretation