Wurm Siege

Trivia
Interestingly, Wurm Siege utilizes the same opening animation (a fiery circle near the base of the wurm) and firing sound of the Flare spell, though usually this is drowned out by other combat noise.

According to the in-game French description of the skill, it is a spell from the Air Magic line dealing lightning damage, but this is obviously erroneous since it has been proven it deals earth damage.