The Harmonic Ember was a gem that allowed one to combine concepts, and the meaning of the word concept seemed to remain as broad as possible.
This merging could be done within the body, which would limit the usage to a single instance, or outside the body. Replicus recalled Stylla saying that it was used once, the Harmonic Ember allowed all who were born with Bryne blood to create techniques based on combining all types of concepts. This meant the Ember was useless to all that followed after the one who found it, at least when it came to enhancing their somewhat famous Twin Contrast Sword Technique.
This was later proven wrong – though Replicus didn't know – by Theurien, the current head of the Bryne Family. Not only had he deviated from the norm of only being able to combine two concepts within himself, instead doing it with three using the Harmonic Ember, the technique he created for himself was not even strictly a sword technique.