In case you don't know how this works, you cast Splinter Storm (2) on yourself. Now you're covered in glass shards that will damage enemies within a few meters, as well as provide 90% damage reduction. Cast and immediately cancel Mass Vitrify (4) to create a wall. Go just OUTSIDE of the wall, then hit it with Shattered Lash (1) to destroy it. This will send glass shards flying away from the wall, damaging enemies and boosting the damage your Splinter Storm does to enemies. You can repeatedly cast Mass Vitrify and destroy it with Shattered Lash which will refresh the duration of your Splinter Storm as well as stack more damage onto it.
Replace Spectrorage (3) with Pillage ([Hildryn]) via Helminth. Cast it whenever you need to remove negative status effects, replenish your shields, or strip armor of nearby enemies.
Tip #1 - Be sure to cast Mass Vitrify at least once every 35 seconds to refresh the duration of Splinter Storm, or it will expire and you will lose all stacked damage. Also, avoid Nullifier bubbles.
Tip #2 - Be sure to have a stat stick (melee weapon with only +physical damage and +elemental damage mods) equipped to significantly boost your Shattered Lash damage and amount added to Splinter Storm. Here is a link to the build I use for Mire as a stat stick in order to stack over 72k damage each cycle.
Tip #3 - Use a primary or secondary weapon with 100% crit chance. Before casting Shattered Lash, shoot an enemy with it to proc Arcane Fury to even further boost damage.
Tip #4 - If your stat stick uses +slash mods, you must break Mass Vitrify with a held cast of Shattered Lash in order to gain the bonus damage. If your stat stick uses +puncture mods, you must break Mass Vitrify with a quick press cast of Shattered Lash in order to gain the bonus damage. You cannot benefit from both types of bonuses at the same time, nor can you benefit from +impact mods, so do not use either approach when modding your stat stick. Again, here is a link to the build I use for [Mire] as a stat stick.