To dream of fireball explosion is interpreted as the dream where the one is fighting with his own anger issues. There are some situations or relationships that made you feel very angry and you are no longer able to keep this anger to yourself.
Dream dictionary: when am fighting with some one dream meanings
If they appear as small innocent beings they symbolize the manifestations of the unconscious. The words and behavior of these beings contain a rewarding and revealing message. If the dwarves are misshapen and ugly they reflect our ignorance and smallness. Fighting with a dwarf may be one of the means to attain true wisdom.