I think they should be divided into Dark Elves and Dungeon creatures from the 3rd game...
Add Dark Spiders, various Shadows... and you'll get a good faction...
And add the old ones to the Dungeon faction (Minotaurs, Dragons)...
The emblem is suitable for the Dark Elves; you just need to take it away from the Necropolis and give the Necropolis a skull...