Marignon CotS - What's the hook?

[Blitz]

Arch Therugs are better, but don't they cost 380 gold? A fully developed COTS communiuon is truly frightening, with all the astral (paralyse, astral healing, antimagic, control, etc), as well as the air (orb lightning, shockwave, thunder strike). You also still get a 4-power priest, with some fire capability... as well as often getting astral/fire mages through national heroes. This means the wind guide/flaming crossbows are more common, and devestating even in a storm.