Put together a full list:
Air
Huntsman - Evasive Aura (like Air's Evasion, but as an aura)
Necromancer - Vacuum Aura (air damage, aura to set silence and suffocating)
Polymorph - Jellyfish skin (immune to air/electricity, vulnerable to poison/earth, bleed electric water)
Scoundrel - Blessed Smoke Cloud (create blessed smoke that makes characters invisible)
Summoning - Cursed Electric Infusion (unlock electric discharge and closed circuit)
Warfare - Mass Breathing Bubbles (as breathing bubbles, but mass)
Earth
Huntsman - Dust Blast (all enemies in range, earth damage, blinds)
Necromancer - Corrosive Spray (corrosive touch cone)
Polymorph - Poisonous Skin (immune to earth/poison, vulnerable to air/electricity, bleed poison)
Scoundrel - Venomous Aura (as venom coat, but aura and 4 turns)
Summoning - Acid Infusion (unlock poison dart and corrosive spray)
Warfare - Mass Oily Carapace (as oily carapace, but mass)
Fire
Huntsman - Deploy Mass Traps (deploy 4 traps, individually targeted)
Necromancer - Mass Corpse Explosion (mass version)
Polymorph - Flaming Skin (immune to fire, vulnerable to water, bleed fire)
Scoundrel - Mass sabotage (mass version)
Summoning - Necrofire Infusion (unlock fireball and epidemic of fire)
Warfare - Master of Sparks (I believe aura version of sparking swings)
Water
Huntsman - Mass Cyrotherapy (as cyrotherapy but mass)
Necromancer - Blood Storm (Blood everywhere, disease and decaying touch on all enemies, damage not mentioned)
Polymorph - Icy Skin (immune to water, vulnerable to fire, bleed ice)
Scoundrel - Vampiric Hunger Aura (as vampiric hunger, but aura)
Summoning - Blessed Ice Infusion (unlock restoration and healing ritual)
Warfare - Mass Cleanse Wounds (mass version)