i found the easiest way to do this is to use the death knight and take over the spawn points. dig out all the stuff surrounding them, then build up a bunch of centaurs around the path they follow and put traps in the path. nobody even gets close to your home base and you can just surround that with banks.
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 "The Tickler"){kind=icon}
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 "Kongai"){kind=icon}
 "Dungeon Defender"){kind=icon}