Welcome to Librarium Online!
Its a 'slaying' song.
On the first day of Christmas, the Dark Gods gave to me
A Necroootic Phylaa-actery
Warhammer Fantasy: Warriors of Chaos, High Elves
Warhammer 40k: Eldar, Space Marines, Orks
All Khorne wants for Christmas is Chuck Norris.
Not a carol but still Christmas related.