Earthbending was splintering into so many specializations: metal, lava, wood, gems, sand, and many more things. She'd thought that water and fire would have stayed more static, but it looked like the tribes and the Fire Nation were both innovating as many new ways of working with their element as they could. Even though she'd brought peace, it felt like everyone was only waiting for another excuse to start fighting each other again.
Avatar: the Legend of Korra, Korra, the Expanding Power of the Avatar