Run a cad, or a salamader formation but just paint them LoTD, works fine. *Unless running Kill Team, where even LotD start on the board. Also keeps with the fluff: a lone Imperial survivor, facing off against unthinkable odds, when these spectres from the warp appear and begin destroying the foes of the Emperor. I found the book slow at the start but it picked up steam quickly and became a typically high octane Space Marine battle with quite a impactful ending. Generally, if running 'pure' LotD*, I'll include some single-character detachment (Assassin, Inquisitor.) to have boots on the table start of the game. The appearance of the titular Legion of the Damned is cool too. I run my LotD army as salamanders, that way they get the bonus to flamers and meltas. I was wondering if the Chaos Marine Codex might offer some appropriate uld make for some interesting conversion projects, too. Maybe some tough units: FNP or INV saves maybe?
Then Deep Strike or infiltration to represent them suddenly appearing. I would be looking at flamer, meta and plasma weaponry to keep with the flavour. The eBook Codex is still available online so I will snag that. Souleater wrote: The losing turn one thing was why I wondered about using another codex, frankly.