These spites are expensive (50 pts) in comparison with all the other spites but they are fantastic value for money !
That is, if you're facing an enemy with an average or below average leadership (say 7 pts)
If you are facing such a foe, such as Skaven, Humans, Goblins etc. Then you should definitely make use of the...
Blight of Terrors
and ensure the character that takes the spites is part of a unit, then get them up close to the enemy and observe the effects of terror.