[Baalz]

Well, I think that this weakness is being overplayed here. Yes, there are effective counters. Yes, very powerful end game magic can not only neutralize them but give them to your enemy if he invests enough resources and effort. Name me one unit that is not the case for. The fact of the matter is that I forced my opponent to research up to level 9 in a school he may not have otherwise wanted (not much point in going up Thau unless you've got strong astral or death), summon/empower/outfit someone capable of casting undead mastery then spent the time setting up an ambush for me....meanwhile I've got no other significant undead troops to use UM on and have been benefiting from my colony the whole game up until this level of counters are available. It's probably also pointless to even bother bloodhunting in the first case because somebody could always just wish for armageddon a couple times! At the point you're worried about penetration boosted level 9 spells surprising you you're past the point any one thing can be expected to be effective by itself most of the time. Then again, you're also looking at army of lead + will of the fates buffed vampires by that time, which is a whole other ball of wax.