Quote Originally Posted by nagash66 View Post
Yes, book 6 extermination has some info on one such thread that took the legions tens of thousands of casualties to take out, taking the dark angels from one of the largest legion down to more or less standard size. Dont remember the details but will look it up tomorrow when i have access to my books.

Hrud migrations have also poped up in HH lore as major threats and having caused the crusade serious problems.
Thank you. The only ones that I've seen while looking are the Khrave and possibly the Fra'al. The Khrave do seem to be something that could be worked into an army if GW wanted to. I'd avoid the Fra'al because of the TSR property of Star Drive with the Fraal (now WotC property) to avoid any possible legal issues.