PoE Explosive Impact, Chaining builds

Hi all, i really like deleting legions with vaal arc and the arc ignite mechanic. I was wondering if one could use heatshiver to take advantage of shaper of flame's extra damage if the hit is mostly fire damage. And we could use freeze by converting lightning damage to cold with call of the brotherhood rings. The problem is getting enough freeze to break bosses' ailment threshold. Currently my POB is at 10mil and i think 25 mil in the minimum? The POB is half baked right now. Anyone wanna help me theorycraft this :P ?

EDIT 1: Prismatic burst doesn't work on spells, so ignore any mention of it. You can try to fit it on Shield Charge 4l, and RF 4l for mapping fast, and use Vaal Firestorm for any singletarget boofing EDIT 2: With Skin of the Lords, use Empower over Cruelty. The bonus skill level makes it a +28 and gigabuffs the damage by almost double. Uniques: and Gear: Use Sporeguard until Skin of lords, with any keystone on tree. It saves you 1 point max. Can experiment with Eldritch Battery or Supreme Ego, no o

this shit dont even have implicits rolled on gear. Leveling: Elemental Overload, holy flame totem Willclash Mid Game: Crown of the Inward eye, decent staff, AL staff swap late Chain Sources (6 total): 4 from lv 21 gem, 1 from lab enchant, 1 from Gloomfang Leveling Uniques: