Avatar The Otherworldly Legend

Fire. Air. Water. Earth Only the Avatar can master all four elements and bring balance to the world. Legend told me how Avatar Korra and her companion preventing Amon from disabling element bending in the capital of Republic City. I the next Avatar that comes from Earth nation trained in all my bending even when the world is already at peace. Till one day. Ancient creatures emerged from deep of the earth come and bringing chaos into the world. I exterminate them and throw their remains to where they belong. but when I exterminate the king of the beast. I can only use my life to trade with the life of the King of The Beast and bring peace back to four nation.