A boss fight is read as the big challenge at the end of a long stretch, the obstacle everything has been leading up to. Its strength in the dream is taken as how large the waking problem feels.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.