3.10 need help with build idea

Since so many people were going heraldry/purpose setup for insane auras and thats getting nerfed/fixed, i would love to try and make another "insane" or high damage herald stacking build. I was thinking of doing a x4 heraldry/endbringer cluster jewel setup for that 25% damage for each herald. And linking them with x2 large cluster jewels with 2 added sockets.

which is like 25x5=125 , 125x4=500 so 500% increased damage with 5 heralds up and that sounds reaaaally good + not expensive at all!

I just need an idea for a build. Any ideas? I was thinking of a Wave of Conviction, arcane cloak assassin that stacks a lot of increased mana cost of skill with fevered mind and Voidbringer Conjurer Gloves. But i dont know. Any ideas?