[3.6] My Best Essence Drain build 2.1milion dot 12k Es, Video UP vs Aul, Lich 756 and Uber Elder

And a little tip for delving, if u using Prism Guardian and talking about best build to delving, try get Watcher's eye with "have phasing under Haste", and use Haste aura.. that will really makes delving awesome.

That not hard to buy another prism guardian, and cheapest jewel with only 1 that mod.