"So how exactly did Lunaria lure you into the maw? And how did you know who I was when I saw you there?"
The first of these questions was one of minor curiosity. It really didn't have too much of baring on the future of the Galaxy as the damage that could have been done by the truth had already been done long before Erich was even born.
The second question, however, was one that Erich was intimately aware of. During his time in the maw he continuously heard Daelia speaking to him telepathically, saying to him things like "Go away!" and the "Darkness consumed all!"
Not only was Erich invisible when he came across Daelia, but this was nearly a million years in the past. How in the hell did she know who he was?"
Since Daelia had promised to tell Erich these things, she chose not to hide the truth from him. She started by answering the first of these two questions.