Devil and Arch Devil

Inferno creatures
Level 1
Imp
Familiar
Level 2
Gog
Magog
Level 3
Hell Hound
Cerberus
Level 4
Demon
Horned Demon
Level 5
Pit Fiend
Pit Lord
Level 6
Efreeti
Efreet Sultan
Level 7
Devil
Arch Devil
Towns

Statistics
Devil
Cost per troop  2700 1
	Attack 19 Defense 21 Damage 30–40 Health 160 Speed 11 Movement Flying Size 1 Growth 1 AI Value
Special abilities:
-1 to enemy luck + no enemy retaliation + hates angels
Arch Devil
Cost per troop  4500 2
	Attack 26 Defense 28 Damage 30–40 Health 200 Speed 17 Movement Flying Size 1 Growth 1 AI Value
Special abilities:
-1 to enemy luck + no enemy retaliation + hates angels
Portraits

Devils and arch devils are level 7 creatures of inferno town. They are recruited from the forsaken palace.

Devils and arch devils can teleport to almost any hex on the battlefield. Their overwhelming attack leaves no possibility for a retaliatory strike. They also do 150% damage to angels and reduce enemy luck by one when they appear on the battlefield.

Devils have an AI Value of 5101, while Arch Devils have an AI Value of 7115

Discussion

Black Dragon versus Arch Devil

The Arch Devil strangely is more expensive than the Black Dragon, at 4500+2M versus 4000+2S for the BD. The Black Dragon has 50% more health, spell immunity, a 2 hex attack, a higher median damage (45 versus 35), a delta 1 advantage in A/D. The Arch Devil has the no retaliation (which makes it somewhat like a ranged unit with running), a -1 to luck special, and +2 speed. 500 more for an Arch Devil? The cost difference seems difficult to justify. Which unit has a better value to the army? Counter arguing, Black Dragons have that cool spell immunity, but that also means that can't be shielded/stone skinned/blessed or what-have-you, whereas Arch-Devils can. I think both pros and cons nullify each other for the low level spells. However, the real difference is in the 2, 4, and 5 level damage spells. Those hit points, which by the way you are paying a lot of gold for, can be dwindled down quite drastically with those damage spells with a decent spell power, devastating that enormous investment. To add to the matter, Arch Devils have the least hit points of any upgraded level 7 unit, tied equal with the lowly Ghost Dragons, and the growth-boosted Phoenixes, both at least 1500 less gold than the Arch Devil. Henceforth, is the Arch Devil over-priced for the value that it brings to the army, the question can be asked? In particular, is the Arch Devil worth more gold than the Black Dragon? The price can certainly be put into question. Something around 4000+2M would probably have been more reasonable, or a little more HP, like 230.