MHD wrote:Earthbending has the master tech metalbending wich, if you pair it with firebending, makes smithing skills1 unlike anython ever before.
Only if you happen to be the one
metalbender in living history.
Earthbending has Metalbending.
That's more on par with bloodbending than anything else. It's not a secondary style like healing or lightning bending, lots of people can do those. It's something that only the absurdly powerful can do, and even then it's practically unheard of.
If you look at the "common" secondary styles of healing, lightningbending, and magnetism*, they all seem to capitalize on what their element does well, while being starkly different
from the normal bending style. Water is a soft form, protective and indirect, so healing makes sense. Fire is a destructive form exclusively, so a narrowing of that destructive power to lightning also makes sense. Same with earth, which is all about being grounded, holding one's place and striking out from that place of strength: treating a wall as solid ground, and fighting at a distance without moving change the dynamic of that, while not being philosophically different.
Air is all about misdirection, avoidance, diversion, and movement. So an air secondary style would be kindof good at all or most of those things.
I suggest illusion.
*That is what the creators said was earth's secondary style, by the by. It includes a lot of the stuff Bumi and the Dai Li did, like spider-climbing walls and clinging to ceilings like they were floors, as well as manipulating earth-gloves to punch and grab people at a distance. It apparently only works on unrefined earth, but presumably toph could do the same trick with metal.