Mayo, did you mean Multitudes of Mercies? I looked in the databases, both NGA and AHS and could not find a Multitudes of Darkness. The registration image, along with the one on her website, showing the brown base color with the watermark is really interesting.
AHS database.... http://www.daylilies.org/Dayli...
I bought some seeds from LA with Multitude of Mercies as pollen parent, all germinated and came through a winter outside well (still in the pot they were sown in with no cover/shelter).
Just thought that the info might be useful if you are thinking of it as a breeding plant for our European climates.