Need Help Powdering Hive Dagger For Rainbow Build

I am making an assassin rainbow spell build, but I'm stuck on how to powder my dagger. I am aiming for a good amount of spell damage but also even element damage. I have tried a lot of combinations of powders but always seem to get 1 or 2 elements that do way less than the others. Any help would be appreciated but please stay on topic.
Here's my build: https://wynndata.tk/s/J67tm0 (Any suggestions of things I should change would be nice also)

Thanks!

 

I recommend using hive weapons as single element, you'll be lacking dmg against heavy elemental def.

 

Could a secondary weapon work?

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But really I was just wondering about how to powder my dagger.

 

I would use it as a water dagger
https://wynndata.tk/s/2otbLr

However you wanted rainbow
https://wynndata.tk/s/7PB14w
(it's probably not the most optimal way to make rainbow dagger, just an example. The key is to use various tiers of powder, not all t6 if you're going with rainbow)

 

https://wynndata.tk/s/5hMmNa is my suggestion.

honestly, although t4 t4 t5 t6 t6 gets your fire damage higher, it sacrifices base damage, and also it sacrifices pierce on the other three elements you choose. anyway, you can replace one dfusion ring with moon pool.