Sunder (transitive verb)
To break apart; to separate; to divide; to sever.
e.g: As the issue of slavery threatened to sunder the United States, President Abraham Lincoln, using biblical language, warned that "a house divided against itself cannot stand."

Vicissitude (noun)
1. Regular change or succession from one thing to another; alternation; mutual succession; interchange.2. Irregular change; revolution; mutation.3. A change in condition or fortune.
e.g: This man had, after many vicissitudes of fortune, sunk at last into abject and hopeless poverty.

Agon (noun)
A struggle or contest; conflict; especially between the protagonist and antagonist in a literary work.
e.g: It is the irresolvable love-hate agon between men and women that drives all cultures.

Condign (adjective)
Suitable to the fault or crime; deserved; adequate.
e.g: He is a violent criminal and, like other criminals, he should be brought to condign punishment.