Don’t muddy this submission with stories from your past. After all, it may be that your current manuscript is a new direction in your career rather than the anomaly implied in your question. For now, keep your pitch focused on the manuscript you are submitting. When an agent or editor is interested in that story, you’ll proceed into deeper discussions, at which time they’ll ask about other projects on your desk and your plans for future stories. That’s the time to introduce them to your trolls, elves, and ancient legends. Then you can decide together whether or not you’re a literary match.