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Aquarina had always admired Sylphy's little Ember Magic, since she was a baby that Sylphy could conjure this one single Spell and then combine it into gigantic Spells. While other people usually had a hard time conjuring their first spell, Sylphy not only could conjure Ember without end, but combine it into Fireball, Fire Tower, Blazing Wall, and even things such as Nova, a spell of high level which conjures compacted flames and unleashed a deadly explosion to a foe or area.
And that's while she was still very young! And that, later on, Aquarina learned was due to Sylphy's special ability, her System. The System granted her among her first Skills one called "Ember" which she no longer uses now, as she had told her it evolved into a stronger, higher-level Skill called [Petit Meteor] after years of just using Ember.