Ignis Master
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The mastery of Ignis is what many dream of and few reach; the immediate power of total control of fire, shifting it into any shape and size the master desires. Flamethrowers, firewalls, fireballs, explosions -- this is where Ignis earns its destructive and violent fame.
Show your character finally harvesting the full potential of Ignis. Do they revel in the full destructive force of fire, perhaps with a final test in destroying and burning as many targets as they can? Or, do they remember the patience and gentleness that they had to practice before, driving the flames in controlled and restrained power so new life can grow?
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Becoming one with the flame also means becoming one with the heat it produces. Ignis masters aren't just about offense, but they learn to be resilient, shrugging off burns, smoke, and heat. This mastery doesn't come easily, however.
Show your character's final test of strength versus the harm of fire. Do they go to scorching deserts to tame the heat, the eye of wildfire to be engulfed in flames, or active volcanos to face walls of smoke? Is this a test they're doing alone, or is it with someone's guidance? Do they struggle versus the elements, or does it feel like a second home?