[CUnknown]

Fire-blessed flagellants will do decent damage, it's true.. and if you combine that with a water-bless for quickness, they will do excellent damage and also close on the enemy quickly.

However, they will die like flies to area affect spells or even just indy archers. Blade Wind would just be sick. They are a nice unit when blessed like that, but not something to rely on as the meat of your strategy. In fact, I wouldn't invest in a strong bless, it is probably not worth your points on a unit that is so easy to counter.

Knights of the Chalice are great units, but not the best bless chassis in the game, either. They are capital only, so on a small map a bless strategy could work very well, but on a large map you might want to reconsider.