If you use any idol with chance to trigger elemental nova when hit while using Focus it will replace the damage dealt as lightning based on % mana with the secondary on hit effects of Elemental Nova (Lightning) with the increased hit rate and AOE when both are setup for channeling. While at first this sounds interesting, it ends up being quite the significant nerf to DPS as it no longer deals damage based on mana, rather only the secondary effect damage of Elemental Nova.
I’m setup straight across the lightning nodes with Overcharged maxed on Elemental Nova then the minimum points to make it a channel.