Well My comment still stands about challenge #4 sucking royally but I did FINALLY beat it after over 100 atempts... The way I beat it and what seemed to regularly get me the closest to winning was....
OMG challenge #4 is absolutely rediculous, The AI is either the worst I have EVER seen or else it is intentionally trying to sabotage you over and over, Great game but #4 has ruined it for me =-\
"Consecration" does damage to an enemy that would normally "Absorb" damage... It does have it's uses! Now if someone could tell me how to beat the "Very Hard" Map I would appreciate it... it is the only map I have left and I can't make it past the 19th wave =-\