Riven mod requires only heat damage, 2nd and 3rd buffs can be whatever you like. If you don't have riven mod then use [Hellfire] instead, though it will be way less effective, obviously. You can save 1 Forma if you wont equip exilus mod.
Best to use with [Khora]'s Ensnare ability that can be infused via Helminth. Zenurik's 2nd ability Temporal Drag with Temporal Shot will also be a great addition to this build.