Trying to understand the name of the game (Spoilers Inside)

[Otomon]

"Ender Lilies : Quietus of the Knights"

Well we know Quietus means "Death of something" so the second part means "Death of the Knight's" and indeed all the knight's in the kingdom are dead.

But what does "Ender Lilies" mean? I know your character is named Lily and her goal is the end the blight, but also Lilies seem to represent the White Priestess in general, symbolically they represent "purity", in one of the endings, we see a Lily blooming as the White Priestess says she wants her legacy to be "hope". However the last boss looks like a blooming Lily, not to mention the game has red and white lilies... so could the red Lilies actually represent the Blight? And thus the "end of the world"? Dont know if there was ever explained if there was a connection between the Blight/Red Lilies but the game seems to imply it.