when i tried strengthening a rusty sword it turned into an op magic sword

It sounds like you're describing a moment where you attempted to strengthen a rusty sword, and unexpectedly it transformed into an overpowered (OP) magic sword. This kind of event often appears in fantasy stories, games, or role- playing scenarios where ordinary items can be magically enhanced or have hidden powers unlocked. If this is from a game, story, or creative idea you're working on, it’s a cool plot twist or gameplay mechanic! If you want, I can help you expand on this idea, suggest how such a transformation might happen, or what powers the magic sword could have. Would you like that?