the thing that made the first Avatar special was not the changes Wan created in the world, but the way he changed himself into a worthy vessel for the Spirit of Light. The greatest power, in the hands of someone who is capable of that sort of self-transformation, is what the world needs to stop Kuvira. … With her friends’ help, Korra has finally regained her determination and expunged the “venom of the Red Lotus,” just as Toph helped her bend the last of the physical poison out of her own body.