I agree with you, Irisado, the FEC could use some additional units. I'm not too interested in Death in general these days, but I appreciate the variety offered by the other ranges in that grand alliance. I do think the lore for the FEC is very unique and cool, though.
That Arch-regent though, looks absolutely amazing! And the Endless spells look great as well. Throne is great too.
Either way, I hope the battletome is great for those who do like FEC. Better Battletomes is never a bad thing!