It's June 1st... so here's an update on how the 2015 Reading Challenge is going:
The Final Prophecy (AKA Nightkeepers) by Jessica Andersen: Books 1-8
Lords of the Underworld by Gena Showalter: Books 1-11
Angels of the Dark by Gena Showalter: Books 1-3
Doomsday Brethren by Shayla Black: Books 2-5
Seduce Me In Shadow
Possess Me At Midnight
Entice Me At Twilight
Embrace Me At Dawn
Sentinel Wars by Shannon K Butcher: Books 4-9
The League by Sherrilyn Kenyon: Books 9-10
Born of Betrayal
I've also grabbed the Eternal Guardians series (Books 1-7) by Elisabeth Naughton...
...but those may wait until 2016.