are stealth units targeted by flames from afar..?

[Boron]

maybe in the late game when you are winning the dominion race anyways, i think. Devils seem better for crushing the heathen in the middle.
In theory, you could pump near twice as many, given hammers, as you could vampires; besides earlier. It is, however, more trouble to organize these devil factories.
A VL can easily summon more of his kith as well as his kin

the problem is 1st you can sacrifice to dominionpush that is quite dangerous . and a vampire lord can cast blood rite if you need fast vampires . each vampire lord gets 7 vampires / turn per bloodrite for only 26 slaves or can summon 1 vampire / turn free .

a soul contract costs 80 blood slaves and as abysia / mictlan who are the main Users of that you can only reduce it to 60 blood slaves with a dwarfen hammer but not more .
so unless you find a site with nice construction bonus it is not cheaper than a vampire lord (55 blood) who too produces 1 vampire / turn and is a good mage as sidebenefit .
sure devils are tougher than vampires but that doesn't count . both are very vulnerable against storm because it cancels their flying . but the vampires are revived as long as you fight in friendly dominion.

i like a main army of vampires and smaller armies of devils or preferable storm demons when i can get them .
the devils / storm demons main purpose is though to destroy enemy temples and raid in order to improve my chances winning the dominionrace to be able to use my vampires without any risk offensive too .