Aenir is a female Ice Dragon and the mother of Ninian and Nils and (optionally) the maternal grandmother of Roy. She is mentioned in Chapter 19xx of Fire Emblem: The Blazing Blade, during a flashback scene. A man who resembles Nergal speaks to two children, who seem to be younger versions of Nils and Ninian, and tells them that he will look for their mother, Aenir. In the English version, the man appears to refer to Aenir as a place.
- It should be noted that, in Nergal's fully expanded death quote in the English version, he should be saying "Aenir" instead of "Quintessence". The word substitution is likely a result of a mistranslation, as "Quintessence" was called "Aegir" in the Japanese version.  Thus, he should be saying "Why did I... want power? ......Aenir? ...Don't...under...stand... but...".
- Aenir's fate remains unknown, though it can be assumed from Nergal's quote during the flashback, "some bad men took mommy," that her fate may have greatly impacted Nergal's lust for power.
- It is never directly said who the father of her children was, although it is strongly implied to be Nergal.