you only need 1 MAU blessing, 5 is a waste,
1 MAU Blessing increase 400% of MAU attack CMIIW (check on your resourceitem.dat)
and that is also max value, so there's no point on having 5 of them,
1 penzer add 0,1 or 10% and max value is 0.5 or 50%...
i dont think your attack decrease...
perhaps it's not hit critical that is all
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you are lucky i happened to check on panzer and MAU Blessing today
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that is why i can answer here...
tho' some people say there's a bug on MAU Blessing, i'm not so sure if it's true or not
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------edit-----
after checking, max value of MAU blessing+panzer+every panzer else is 5.0
without any of those item it value is 1.0
with 1 MAU blessing it's already become 5.0
panzer and any other panzer generator (cash or NPC) did not affect it at all (at least not in serverside) not sure about clientside