Edelstein quests: HNNNNNNNGGGGGGGGGG

But Neinheart was talking in the past tense, meaning that it happened before the black witch's attack.

Couldn't the fact he mentions that occurred in the day of the "War of Edelstein", be the day where Eleonore turned Dunamis into a cursed knight, and Ereve has fallen under the Blak Mage's curse?
He says he wasn't even able to protect the empress, in that day, everyone was powerless except Shinsoo, who's sleeping, as usual.

Couldn't the fact he mentions that occurred in the day of the "War of Edelstein", be the day where Eleonore turned Dunamis into a cursed knight, and Ereve has fallen under the Blak Mage's curse?
He says he wasn't even able to protect the empress, in that day, everyone was powerless except Shinsoo, who's sleeping, as usual.

uh I don't have a Cygnus character... but is that from quest text? o_O

Couldn't the fact he mentions that occurred in the day of the "War of Edelstein", be the day where Eleonore turned Dunamis into a cursed knight, and Ereve has fallen under the Blak Mage's curse?
He says he wasn't even able to protect the empress, in that day, everyone was powerless except Shinsoo, who's sleeping, as usual.

If you mean the 120 Cygnus quest then no. Neinheart specifically mentions that it was before you were around, and obviously the 120 quest takes place at the peak of your knighthood.