Splinter Storm absorbs the damage from a detonated Mass Vitrify to give you more damage on the shards flying around you or your teammates. This can be stacked and since Mass Vitrify resets your duration on the Splinter Storm that means you can stack it as high as you need to be able to instantly kill enemies by just running into them.

Fire Blast is subsumed to allow us to more easily deal with armored enemies. We can also run Shuriken or Ensnare but they can force us to run slightly different mods. [Seeking Shuriken] can be placed over [Adaptation].

[Corrosive Projection] helps us to deal with armored enemies even further. You can replace it with other mods if you're going against unarmored enemies but that also would make Fire Blast unneeded.

[Adaptation] and [Rolling Guard] are flex mods but since you're going to be forced into melee range you should probably have some way of protecting yourself. They can be replaced with more range or more duration depending on your playstyle.

Arcane Aegis gives you 12 seconds of functional invincibility due to how shield gating works. You can replace it with any other arcane to suit your playstyle like Arcane Resistance or Arcane Deflection if the enemies are putting out a lot of those procs.