Counter Elements
The Counter Elements are the enemies of the Elements. They are also the strongest of their kind. There is always one and only one of each Counter Element on the earth at any given time. They hardly clash with the Elements, though, saving their strength for when they do try to overpower and destroy the Elements once and for all, destroying the very symmetry of life. The Elements must work together to defeat the Counter Elements, otherwise it is possible for them to get destroyed forever and doom mankind.