The purpose of this build is to give you a decent amount of Weapon Power and enough Attack Speed to kill off enemies quickly. It also makes you somewhat more self-sustainable so you can survive a little bit easier on your own. You also need to be somewhat aggressive in order to generate enough money for the items for the next rounds.

I rarely get into round 6 and 7, but I added enough optional items that I hope round out the build if you're struggling to get the costlier ones.