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		| They're good at pushing back dominion, but not for anything else. | 
	
 They are good out of the box, without any research. And Ermor is much easier to kill if you start the war turn 6-7. Later on it becomes much more of a problem, due to much larger number of freespawn.
Also, smite spam from 5+ priests is pretty cruel early on, so you won`t have a problem finding something to do for them.
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		| through crystal matrix on all slaves is still respectable and allows you to | 
	
  ...to waste a large number of gems really fast. 
 
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		| a 5-man goethic communion/sabbath gets PotS | 
	
 An astral pearl for every skirmish? 
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		| a 5-man goethic communion/sabbath gets PotS, and thus guaranteed H3 on all slaves | 
	
  Goethics are only H1 in CBM. PotS gives them another +1. 1+1=2 :P
Remember, communion slaves get communion bonus only for spells that masters cast.
BTW, casting Sabbath immediately gives them 50 (49?) fatigue, so they`ll pass out faster (important when fighting against really big undead armies)