A technology that able you to kill a kind of specie of your civilisation, with a huge decreasing of the hapiness.Following the specie you exterminate you win politic bonus of the opposite side. Ex: you kill industrial pop you increase ecologist politic, science pop => religious politic  etc...  But when you kill military pop you don t increase peace politic. This could be a law and not a technology, i don t know what would be the best.