PoE Pledge of Hands, Orb builds

I just wanted to post about my build idea and tested since I think its really cool. I've tested Hydrosphere with spell echo and can confirm that the final repeat does have a 100% crit chance and when using it with greater spell echo it also inherits the extra aoe and more damage multiplier. Scion Archmage: This is a (not that good) pob for an archmage scion that I used the interaction with. I stacked cast speed to make the build be able to clear maps a bit more smoothly but its strength is definitely in bossing. I defensive laye

Here is a rough POB setup for frost bomb. A lot is missing and could be improved, but all things considered I don't think it is that bad... Gotta set up its defenses though if I want to use it. I am looking for general thoughts on it. I know it is missing a lot, I'm relatively new to making POBs so I still don't know where to add everything or how to make reasonable rares.