I was thinking that too. To translate, they both have Terror, Killing Blow, Undead and Hover special rules (are they the only models in the game with Hover?). Harbingers have 5+ AS and two hand weapons and are special, the Archai have 4+, halberds and are rare. Both alos have a rule which means they and all untis within 12" suffer one less wound due to instability. Is it just me or is 80 points for a model with only a 5+ armour quite a lot for a fairly fragile model? Anything with great weapons is going to chop these guys up in short order.