Erich had one chance encounter with Daelia before she was shipped off back to her people. The woman was traumatized. After all, she had sat in the cell of a foreign nation which she was an adversary of. One which she looked down upon.
Yet they had detected her almost immediately, and compelled her to spill her secrets. In fact, Erich did not tell Lunaria this, but he learned quite a bit about the ancient Elven Empire, and the schism which destroyed it, at least from Daelia's perspective.
He, of course, was never directly in charge of Daelia's interrogation. Rather, Tia conducted those experiments herself. Because of this, Daelia was confused when she came face to face with Erich.
The mighty Shadow Queen of the Svartalfheim Federation was skittish, and terrified, almost like an abused animal, as she sat in front of Erich who debriefed her on the changes that had occurred across the galaxy during her captivity.