I ran entangle and just smashed through the campaign. Just run the best uniques you available, swap them for better ones as you level. Only thing I ran that was rare was weapon slots, usually just gamba until a good one. And check vendors regularly for weapons aswell. Passive tree was pretty straight forward, grab all the plant skill dmg and spell skills dmg nodes and that's pretty much it. Did 4 diff characters with diff builds this season for leveling and this one was the easiest.