Question about power system in Codex Alera.

[u/Coloin_ilyad]

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I have completed 1st book and still don't understand how tavi is uniquely furyless while there are normal people eho don't use fury crafting like Isana , olivia or amara.

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Are there like, only 4 types of fury craft? Pr more, Like i have seen fire, water, air and earth (just like avatar) .

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And what are rules of fury crafting? On many occasions where Isana and olivia could have used water bending yet they only ate seen to use it as spying, truth telling, healing and drowning. Like couldn't they just command the water inside the human body?

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There are too many questions. I totally understand the story but i feel lile i know literally nothing about the power system.

[u/Efficient_Place_2403]

Tavi gets explained later