The Homunculi (with second Greed, not the first) vs the Legend of Korra villains (Amon, Unulaq, Kuvira and all four members of the Red Lotus). Vaatu is not involved.
The Homunculi (with second Greed, not the first) vs the Legend of Korra villains (Amon, Unulaq, Kuvira and all four members of the Red Lotus). Vaatu is not involved.
Splashing them with lava seems to be a game ender even with their regen seeing as lava isn't just going to go out