Talk:Avatar/@comment-4991841-20120628171752/@comment-5142112-20120701032328

I'm not quite sure but here are some therys

blood becuse 1 that old lady invented it and 2 becuse blood bending is considered a truly evil practice, not something the avatar would want to do

metal becuse Toph invented it and Ang and Kora ether didn't get arond to it or aren't powerful enogh earth benders

lighning I'm not quite sure of but I think Roku and past fire avatars probably could we just have't see them, due to the fact that you cant bend in the spirit world and that where you see Roku mostly.

another thing is that blood, metal, and lightning are alterations from the original elements. you said that they were pureist forms but I think that they are acualy the nonpure forms and I'm sticking to that thery.

also I think it's interesting that no air alteration has been formed but tats probably becuse there hasent been many airbendersto creat one