PoB of gear: https://pastebin.com/kp0kTp3N

(only shows the gear as I have absolutely no clue how to set up the dps calc for this in PoB, if someone knows how please let me know)

The frac dot multi wand was the reason for testing this, and rolled the following crucible tree:

10% increased effect wither
22% more cast speed
EoW can poison mod (the 15% more dps mod is stackable on shield also)
(along with spelldmg leech as ES & +1 min frenzy)

This turned out a lot better than I expected, and the ramp is pretty nuts as can be seen on first phase Maven (when I dont mess up) taking roughly 8 seconds.

Big cast speed gloves for the dps link freed up aura setup body armour to squeeze more auras into build, perhaps with more minmax you can squeeze in something more like Aspect of the Spider, but not sure if worth since you stand at a distance anyway.

Would not recommend for mapping