This build was inspired by at least three other builds in DDplanner that I found.
Map is small in comparason to the cores and minion icons so I hope it all makes sense.
I managed to get the auras all buffed with 1 buff beam by upgrading two other buff beams twice then placing the actual buff beam and upping that twice.
5. Try to keep the minions here a little further away from the crystal, they're mostly here to block tanky orcs and web ogres.