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Best towers to defend left while you get to work are blazing gem, swamp monster (with stun and possibly execute upgrade if you need it) and a single orc warrior den to keep the giants within the range of your blazing gem. You can also add any other tower where you want to work towards the achievment, but these are the best for the core defense. Best hero is Eiskalt (anyone with lots of CC/AOE damage works too), you can even do it on impossible with it.