I know that the Walluru spells are going to have utility paths along with the original pure damage one, so here are my ideas! (when maxed out)
Realistic ideas:
Fire: 500 fire damage, gambit enemy DoT for AOE 180 HoT(4 rounds)(affects individual enemies)
Ice: 395 ice damage, gambit 2 of your wards for AOE 20% myth and ice traps
Storm: 475 storm damage, clear enemy charm for -50% infection(affects individual enemies)
Life: 370 life damage, gambit 2 of your HoT for AOE 20% bladestorm
Death: 370 death damage, clear enemy charm for AOE -30% legion shield(affects individual enemies)
Myth: clear enemy ward for 270 protected bomb DoT, 280 myth damage(affects individual enemies)
Balance: swap 1 charm and 1 curse with all enemies, 440 balance damage.
Fun Ideas:
Fire: 330 Fire damage, steal 1 HoT from all enemies
Ice: 345 ice damage, ignores your curses, enemy wards, and enemy resist
Storm: clear 2 of your curses for +50% blade, 505 storm damage
Life: 345 life damage, remove 2 DoTs from self for 240 HoT(4 rounds) AOE
Death: same as realistic
Myth: same as realistic
Balance: 395 balance damage, If enemy has charm, add 230 damage(affects individual enemies), If enemy has a curse, drain 35% damage(affects individual enemies)