Undine's Friend

In a confrontation with Undine, Deneve notices Undine's second sword has a different symbol than Undine's. Deneve guesses that a friend of Undine died, possibly because Undine at the time was too weak to protect her. So Undine took her sword in her friend's memory.

Anime and Manga differences

 * In an Anime flashback, an earlier untransformed, frail Undine stands over the body of her fallen friend holding her friend's sword.