Eden Dragon's Idyll Eruption

Eden Dragon's Idyll Eruption (絶好噴火, Kanpeki Funka): A strong spell that, when cast, summons an immense pillar of highly-condensed aurora-light to explode out of ground, devastating all those caught in the spells area of effect. The ethernano used to cast must be pressurized so intensely, that the aurora-light it generates is ignited, giving the divine light a fiery hue. With enough time, the size of the eruption be significantly increased, making this spell extremely effective when coupled with the element of surprise.

Description
A Dragon Slayer ability that, when cast, triggers a massive eruption of scolding aurora-light capable of engulfing enemies in a wide burst of powerful magic power. Mechanically, the caster channels a powerful current of aurora-light through the ground, further condensing the light until the the pressurized magic power erupts out of the ground like a geyser. The caster can widen the area of effect, granting the wizard great flexibility to incinerate large clusters of enemies in. The strength of this spell directly decreases with the distance over which it is cast. This means that, while taxing, the area of effect can be projected over a small distance and still be capable of inflicting severe damage on a group of opponents.