When I get it into Luck of the Strigoi you'll see that it's supposed to be said in arrogance to mock the classic darkness of vampires.

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In fields of green;
That I have seen;
For a million years it seems;
How is it so;
Brother, who's blood I know;
That thy lilies so black might grow?

On the gates of hell;
Where demons dwell;
Yet justice true is seen;
Tis there alone;
Could lillies grow;
In such evil shades as these.

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