The opposite of synergy
- The idea that combined parts have properties that are more or less that the sum of the parts. The negative-sum version is sometimes called dysergy, leaving synergy to mean only beneficial effects.
note. i am not entirely sure if the usage in the example provided is right, as it is a very uncommon word, but submissions require an example so i'll give it a whirl.
the heros fought against each other in dysergy.