Nam Master
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Even for those who practiced their Nam skills on land, there comes a time where they must dive. Controlling water is only part of the path; being submerged and surrounded, becoming one with it, is essential for a well rounded master. Many resurface, scared of drowning, but those who succeed will never see swimming the same again.
Your character must take the plunge. What place do they pick? A river, a lake, the ocean? Why? How does it feel to let themselves sink? Do they fear drowning, focusing on holding their breath; or are they tranquil and peaceful, letting their Aether do the work and relaxing as they drift under the current?
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A small wave or a normal current are nothing to be feared, but they can quickly spiral and become more and more powerful. Similarly, learners build upon the strength of their casting and control, and the finish line comes with crashing tsunamis and powerful whirlpools.
Show your character creating and controlling water in powerful, grandiose ways. Do they stand on the surface of the water while forming whirlpools and waves, or are they riding them all the way, shifting the direction as they please? Does the water show resistance, and do they fear being overwhelmed? Are they doing this in a body of water, or channeling water from the air, other beings, and themselves to perform these feats?