The original Space Marine LotD, rather than the Chaos Cultist army list?
The way I remember it, the Legion of the Damned used to be the Fire Hawks, but they got trapped in the Warp and were horribly mutated. Rather than turn to Chaos, they remained loyal, and occasionally appear to help out other loyalists, before vanishing into thin air. Basically, they're undead Space Marines, who fight like mad in the hope that they are killed in battle, and their agony is ended.
(I'd be interested in knowing what the Inquisition thinks of them.)
But that's old fluff; I don't know what the current story is. They're probably C'tan or something now. :roll:
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