Mage/Dark Wizard Water Damage Arcanist Build for Endgame?

Hello,
I've been nearing endgame with Arcanist Mage. Just as a fun little challenge, I only use water wands, and I try to avoid investing points in Agility or Defense. Now, the problem is, I am still using Ultramarine along with a very good Sanare. I know this build will eventually catch up with me, but I really am clueless about building. Is there any water damage + spell damage build that will work for my Arcanist?
Thanks in advance.

 

https://wynnbuilder.github.io/build...0006C10009I10009I1004fI0z0z0+0+0+0+0-ltYFFF-2
WynnBuilder build:
> Aquamarine
> Cardiac Arrest
> Chaos-Woven Greaves
> Pro Tempore
> Yang
> Moon Pool Circlet
> Lachesism
> Diamond Hydro Necklace
> Third Wish [w6w6w6]

this has very low survivability because of etw with no walkspeed
the wand isn't exactly 100% water but it's a good one
mana is quite overflow for arcanist so use something else as necklace if you don't feel like using it