A wise person would make an audio trigger for Crystalline Expuntis. This spell is a 1200/tick mana drain AND a 600/tick endurance drain. The resist check is -400 chromatic, but I got hit pretty often with 635 resists across the board (minus corruption).
Use the following for your audio trigger: "You are weakened by a blast of crystalline energy" I also made a hotkey to inform my group I needed a cure.
Also of note, this spell is directional. Face the exterminator away from the group to avoid nailing the entire group.

Aderirse Bur
Blue Diamond
Brightly Pulsating Chronal Shear
Chronal Resonance Dust
Crystal Embedded Earthbound Stone
Crystal Notocept
Crystal Presciator
Crystal Servotine
Crystal Vorotract
Crystalline Essence
Dimly Pulsating Chronal Shear
Earthtouched Crystal
Earthtouched Diamond
Elegant Adept's Shard
Elegant Combatant's Shard
Elegant Defiant Battleaxe
Elegant Defiant Nightstone
Elegant Defiant Square Hammer
Faceted Crystal
Faintly Pulsating Chronal Shear
Gem Embedded Earthbound Stone
Hagorn's Gem of Fortification
Harmonagate
Prestidigitase
Pulsating Chronal Shear
Rallosian Casterix
Raw Amber Nihilite
Raw Crimson Nihilite
Raw Indigo Nihilite
Raw Shimmering Nihilite
Rune Binding Powder
Scale Ore
Shattered Crystal
Song: Denon's Dirge of Discord Rk.II
Staurolite
Tome of Maelstrom Blade Rk. II
Uncut Alexandrite
Uncut Amethyst
Uncut Black Sapphire
Uncut Combine Star
Uncut Demantoid
Uncut Goshenite
Uncut Morganite
Uncut Rubellite
Urticaceae
Vial of Primal Crystal Fluid
