"is telling it. I would propose that the story be told from the perspective of an ancient Heron Guard - one who only became Heron after Connacht ascended to the Emperor's throne."
A Heron guard who was so old to have survived from the war vs Moagim Reborn all the way to Soulblighter? Far fetched but doable...
Part of me wants a vetran Heron Guard, not an ancient one during the war... Perhaps 100-200 years old, enough to have his own dealings with the Myrkridia and to know of the desperation of the Heron Guard being spread too thin... I have a few ideas, I will write up some fanfic and post it here... Sort of inspired by your idea of a remake of Myth 3 but in my own perspective...