When the wise Chancellor of Thilikos – a matriarchal desert city,- dies unexpectedly, Indigo is thrust into the new role and must find a way to secure her country’s continued existence despite impending war, a global virus epidemic and rebellion by the Council and her citizens.

It wold be be better to drop the names and concentrate on roles and traits.

E.g.:

When the ruler of a matriarchal desert city dies unexpectedly, [her daughter] must take over and secure her country’s continued existence despite impending war, a global virus epidemic and rebellion by the Council and her citizens.