There was discussion about blesses on IRC many times. I think that best idea [mine! :P] was to get precision bonus from air bless, so it could be another bless for mages/archers.
Berserk certainly can be useful. It's not my favorite bless generally, but it has its uses. And is already taken with nature. Blood, on the other hand, is pretty much completely pointless. It could give 1 extra hp to the blessed unit and be better
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There was discussion about blesses on IRC many times.
Speaking of which, as per Jurri's suggestion, who still adheres to his strict code of not posting on the forums anymore, here's the official theme song of the IRC channel:
Re: Patch v3.25 released!
Come to 
Visit my 
Hybrid Mode
