Legion of the Damned
Perhaps one of the most BADASS Space Marines. EVER
Thay are Spacemarines that were mutated, died, and traped in the warp, faithfull to the Emprah... put simply, zombie/spirit of a space marine that kills things that are bad.
GW has given them an ID crisis, because it couldn't make up its mind between a everygrowing army of GOOD badass dead people, something orginal, or a a dwindling group of badass mutated Space Marines. that are slowing getting killed by mutation.