Finding the weapon in a dream is read as finding the cause behind a hurt — the word, the act, the choice. Dream books see it as a wish to understand how damage was done.
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.