yeah, ghouls are seriously craptacular, they need something like Ner'zhul's Grace or something. Usually when i'm assaulting an Orc base i target burrows 1st. They fall down really quick, and if it's a rush, he probably won't have more than two or three. As for UD frost towers, ignore them, they have awesome armor and would take forever to bring em down. They only dish out 9-10 damage anyhow, usually doesn't make a difference, but if you can, avoid attacking UD.
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