>>94285>What are some savage ways to break up another couple?
Encourage their love and wait until one of them dies of sickness or old age.
I'm not really joking. Having seen my mother bury my father in her 40s after he died of cancer - about as savage as it gets. People can't handle random chance. They think it's unfair and start resenting people who have better luck. Seemingly no reason will always be more savage than anything you can engineer.